Steam cauliflower rice until tender. While rice is still hot, drizzle with rice vinegar and mix vinegar into the rice. Taste and add more vinegar if needed. Add 1 cup of cauliflower sushi rice to each meal prep container
In a large bowl, add spicy mayonnaise ingredients. Mix until evenly blended. You can add or use less sriracha depending on personal spicy level preference. Add tuna to bowl. Mix until tuna is evenly coated in spicy mayonnaise. Add tuna to the meal prep containers, dividing evenly between the three containers.
Add cucumbers to each meal prep container. Garnish rice and cucumbers with black and white sesame seeds. Garnish tuna with scallions. Keep containers stored in the fridge for up to 3 days.
Notes
I like to make the sauce using kewpie mayonnaise*, which is a Japanese mayonnaise that is richer (made with only egg yolks) and slightly sweeter than regular mayonnaise. However you can use regular mayonnaise as well. If you want to reduce calories, you can also use light mayonnaise.
Make sure to use seasoned rice vinegar* and not regular rice vinegar. Seasoned rice vinegar is less acidic and sweeter than regular rice vinegar and is used to make sushi rice.
I do not recommend making too many of these unless you are prepping for multiple family members. The tuna will only store about 3 days in the fridge and there is a limit of how much canned tuna should be consumed weekly. Please consult the FDA website for guidelines for a safe amount of tuna to eat weekly.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.