Tuna-Avocado Rice Bowl with Sriracha
Brown rice seasoned with vinegar, piled with tuna, ripe avocado, and crisp cucumber, finished with a drizzle of Sriracha. The whole bowl lands at 43 g of protein and 10 g of fiber in 15 minutes.
That half tablespoon of soy sauce is pulling double duty. Research by Baynes et al. found that traditionally fermented soy sauce added to a rice meal boosted iron absorption by 3.3× (P = 0.0002). Fermentation creates compounds that keep iron available through digestion. Brown rice naturally carries compounds that trap iron, and the soy sauce quietly works against that.
Ingredients
- brown rice 84 g
- vinegar 5 ml
- tuna, in water 140 g
- soy sauce 8 ml
- avocado 0.5
- cucumber 0.5
- Sriracha sauce 8 ml
Method
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Cook the rice according to the package instructions. Stir in the vinegar for extra flavor and let it cool.
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Drain the tuna and mix it with pepper and soy sauce.
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Cut the avocado into cubes and slice the cucumber thinly.
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Divide the cooked rice into a bowl. Neatly arrange the tuna, avocado, and cucumber on top.
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Drizzle Sriracha over the bowl.
Naturally brewed soy sauce for Step 2 matters here. Baynes et al. tested traditionally fermented soy sauce with a rice meal and measured 3.3× higher iron absorption. The fermentation creates specific compounds that keep iron soluble through your gut. Unfermented soy had no benefit in the same experiments. Most bottles labeled "naturally brewed" qualify.
Behind this recipe
Can I use white rice instead of brown rice?
Yes. The meal works either way. Brown rice adds roughly twice the fiber per serving compared to white rice, keeping this bowl at 10 g of fiber. It also has higher phytate content, which normally traps iron. That is actually where the soy sauce pairing becomes more relevant: Baynes et al. found fermented soy sauce increased iron absorption from a rice meal by 3.3×, effectively counteracting that downside.
Read the full evidence reviewIs 43 g of protein in one sitting too much to absorb?
No. Research has moved past the old 30 g ceiling. Recent studies found that the body continues using protein well beyond 30 g per meal for muscle protein synthesis. The 43 g in this bowl comes mainly from the tuna, with smaller contributions from the brown rice and avocado.
Read the full evidence reviewWhy does the recipe say to let the rice cool?
Cooling cooked rice converts some of its starch into resistant starch, a type of fiber that passes through digestion more slowly. This can slightly reduce the net energy your body extracts from the rice and feeds beneficial gut bacteria. It also gives the bowl a firmer, sushi-like texture that holds up better under the toppings.
Read the full evidence review
