Make the rice per the package directions. When cooked, sprinkle in the vinegar and sugar. Stir very gently with a fork or paddle to combine. Taste, and add more vinegar or sugar to your preference. Let the rice cool slightly so it is warm but not hot when you're ready to serve.
Whisk all of the sauce ingredients in a small cold sauce pan. Turn the heat to medium and bring the sauce to a simmer. Simmer for one minute, stirring, then turn the heat off. Let the sauce sit and cool while you prep the rest of the bowl ingredients.
Combine the crab, mayo, and sriracha in a bowl. Taste, and add more sriracha or mayo to your preference. Store in the fridge until ready to use.
Assemble the bowls with a bed of rice and/or spinach, top with spicy crab and any other toppings you'd like. Drizzle with the poke sauce and serve immediately with cold ingredients over warm rice. Enjoy!
