I mix this with canned tuna for a kid-friendly pantry version of "spicy tuna roll" sushi.
Spicy Mayo Sauce
1/2 cup mayonnaise
3 Tablespoons sriracha sauce (to taste- you'll be surprised how much you can use before this gets spicy)
2 or 3 Tablespoons rice vinegar
Mix mayonnaise and sriracha sauce in a bowl, and add enough vinegar to make a sauce. It shouldn't be runny, but more like the consistency of salad dressing. Decant leftovers into a squeeze bottle and use to garnish the top of your sushi rolls- this stores well in the refrigerator.