Seaweed Tofu Soup

Let’s be real: after a long day of work, the last thing you want to do is slave over a fancy, complicated dinner. Or maybe you’re trying to eat lighter, flush out some bloat, or just need a quick, comforting soup that doesn’t skimp on flavor. Enter this seaweed tofu soup—my go-to lazy weeknight meal that checks every single box. It’s light, packed with good-for-you ingredients, and done in under 30 minutes total. I’ve been making this for years, and even my pickiest roommate begs for seconds every time I whip it up.

Why This Seaweed Tofu Soup Is Worth Making

First off, let’s talk about the benefits, because who doesn’t love a meal that tastes good and does good for your body? This soup is basically a detox in a bowl: seaweed is loaded with iodine, fiber, and antioxidants that help support thyroid health and flush out excess toxins. Tofu is a lean plant-based protein source that’s gentle on your stomach, low in calories, and great for anyone trying to lose weight or eat more sustainable meals. Throw in some fish balls and dried scallops for a subtle umami boost, and you’ve got a soup that’s way more flavorful than it has any right to be.

I also love this recipe because it’s totally customizable. Hate fish balls? Swap them for shrimp or even just leave them out and double up on the seaweed. Don’t have dried scallops? No problem—they just add a depth of flavor, but the soup still tastes amazing without them. It’s the perfect recipe for when you need to use up random odds and ends in your fridge too.

Full Ingredients For Seaweed Tofu Soup

Before we dive in, let’s list out exactly what you’ll need. I’ve kept the ingredient list simple and easy to find at any regular grocery store:

• 1/2 block firm tofu (about 7 oz / 200g)
• 1 handful dried or pre-cut fresh seaweed (I use pre-rinsed quick-cook seaweed to save time)
• 4 fish balls (optional, but they add such a nice chewy texture)
• 10 dried scallops (these make the soup taste way more rich than plain water)
• Pinch of salt (start small—you can always add more later)
• Pinch of monosodium glutamate (MSG, or skip it if you don’t like it—this soup tastes great either way)
• 4-5 cups of filtered water (or even tap water if you’re in a real rush)

Pro tip: If you’re using dried seaweed instead of pre-cut fresh, make sure to soak it in cold water for 10 minutes before using, then rinse it well to get rid of any excess salt or grit. I usually skip this step with the pre-rinsed kind, which saves me like 10 minutes total—total game changer for busy nights.

Step-by-Step Guide To Making Perfect Seaweed Tofu Soup

Okay, let’s get cooking! This is such a straightforward recipe, even if you’ve never made soup before. I promise you won’t mess this up.

1. First, grab your tofu block. I almost always buy firm tofu because it holds its shape better when cooking, but soft tofu works too if you prefer a creamier texture. Just make sure to pat it dry with a paper towel first so it doesn’t make your soup watery later on.

2. Next, set your seaweed aside. If you’re using dried seaweed, go ahead and soak and rinse it now like I mentioned earlier. If you’re using the pre-rinsed kind, just pull out the amount you want and set it on a plate.

3. Now let’s prep those dried scallops. Pop them into a small bowl, pour in just enough hot water to cover them, and let them soak for 15 to 20 minutes. I know some people skip this step, but the water you soak them in is full of amazing flavor—save it! We’ll add that to the pot later instead of just plain water.

4. While the scallops are soaking, cut your tofu into 1-inch cubes. I like to cut mine into small, bite-sized pieces so they’re easy to eat with a spoon. If you’re using soft tofu, be extra gentle so you don’t break it apart into mush.

5. Grab another handful of seaweed if you’re using the pre-portioned kind, or drain your soaked seaweed and pat it dry. I usually do about a cup’s worth per serving, but feel free to add more if you’re a seaweed fan like me.

6. Alright, time to start the soup! Grab a medium-sized pot and pour in your 4-5 cups of water, plus the soaking water from the dried scallops (strain it first to get rid of any grit at the bottom of the bowl—don’t skip that, or you’ll end up with sandy soup, yuck). Add your seaweed directly to the pot now.

Quick side note: I use pre-rinsed, no-soak seaweed 90% of the time, so I just toss it straight into the pot. If you’re using fresh seaweed, you can add it now too—just make sure it’s clean and cut into small pieces first.

7. Toss in your fish balls next. I love how these add a little burst of savory, chewy goodness to the soup, but if you’re vegetarian or just don’t like fish balls, feel free to skip them or swap in diced mushrooms or shrimp instead.

8. Now add your drained dried scallops to the pot. Don’t worry if they look a little tough right now—they’ll soften up as the soup simmers, and they’ll add so much umami flavor to the broth.

9. Turn the heat up to high and let the pot come to a rolling boil. This should take about 5 to 7 minutes. Keep an eye on it so it doesn’t boil over—trust me, I’ve cleaned enough stovetops to know that mess is no fun.

Once the water is boiling and the fish balls start floating to the top, that means they’re almost done cooking! This is a good sign that your soup is coming along nicely.

10. Carefully add your cubed tofu to the pot now. Be gentle so you don’t splash hot water on yourself, and don’t stir too hard right away—you don’t want to break up the tofu cubes.

11. Let the soup simmer for another 3 to 5 minutes. This gives the tofu time to heat all the way through, and lets all the flavors from the seaweed, scallops, and fish balls meld together into a perfectly balanced broth. You can smell it getting more flavorful by the minute, right?

12. Now it’s time to season! Start with a tiny pinch of salt—remember, you can always add more later, but you can’t take it away if you add too much. Taste the broth first to see if it needs salt, because the dried scallops and fish balls already add some saltiness on their own.

13. If you like, add a tiny pinch of MSG now. I know some people get weird about MSG, but it’s just a natural flavor enhancer that makes the soup taste way more rich and savory. I add it every time, but feel free to skip it if you don’t want to use it.

14. Turn off the heat and carefully ladle the soup into bowls. I like to serve mine with a little extra seaweed on top for garnish, and sometimes a drizzle of sesame oil if I’m feeling fancy. But even plain, it’s perfect just the way it is.

15. And that’s it! Your easy, healthy seaweed tofu soup is ready to enjoy. I like to pair this with a side of steamed rice or some quick stir-fried veggies for a full meal, but it’s just as satisfying eaten on its own.

Tips For Making This Recipe Even Better

Let me share a few quick hacks to make your seaweed tofu soup taste even more amazing, based on years of trial and error:

• If you don’t have dried scallops, use a small cube of bouillon instead to add extra flavor to the broth.
• Add a handful of baby spinach or bok choy while the soup is simmering for an extra serving of veggies—no one will even notice, and it makes the soup more nutritious.
• If you’re making this ahead of time, don’t add the tofu until right before serving. Tofu gets mushy if it sits in the broth too long.
• For a creamier soup, blend a small handful of the tofu and seaweed with a cup of broth, then stir it back into the pot. This adds a nice thickness without using any cream.
• If you hate the texture of fish balls, use canned tuna or cooked shrimp instead—they add the same savory kick without the chewy ball texture.

Who Should Make This Seaweed Tofu Soup?

Honestly, everyone should make this soup at least once. It’s perfect for:

• Busy weeknights when you don’t have time to cook a big meal
• Anyone trying to eat lighter or lose weight, since it’s low in calories but filling
• People who love detox-friendly meals that support their health
• Anyone who wants a quick, comforting soup that doesn’t taste like plain water
• College students or people living on their own who need easy, cheap recipes

I’ve made this soup for friends who said they “hate tofu” and they ended up asking for the recipe—so even if you’re not a huge tofu fan, give this a try. The seaweed and scallops do such a good job of masking the mild tofu flavor, and the texture is so soft and gentle.

Final Thoughts On This Easy Seaweed Tofu Soup

At the end of the day, this recipe isn’t about being fancy or impressive. It’s about making a quick, healthy meal that tastes good and doesn’t stress you out. I’ve been making this soup for years, and it’s still one of my favorite go-to meals when I’m tired, busy, or just craving something light but satisfying.

The next time you’re stuck wondering what to make for dinner, give this seaweed tofu soup a shot. I promise you won’t regret it. And if you do mess up? No big deal—just add more salt or toss in some extra veggies and call it a day. Cooking is supposed to be fun, after all!