Chop your cauliflower into small pieces that can fit into a food processor. Pulse for 2 seconds each time—until the cauliflower looks like rice.
Spread the processed cauliflower on an aluminum foil-lined in a baking sheet, and then spray it with some olive oil. You can also toss the cauliflower with the olive oil and then spread it out in an even manner.
Toast in your oven for around 30 minutes, and make sure that you stir twice to allow even cooking.
Preparing the sushi
Start by mincing your tuna, and then mix it with the avocado mayonnaise, a pinch of salt, and sriracha.
Slice your cucumber into thin, long strips.
Slice the avocado into thin slices
Next, place the nori on your bamboo mat or towel, and then cover it with the cooked cauliflower rice. Make sure that you leave a 1-inch gap at the far end from you.
Now, start layering the topping on the end that’s nearest to you.
Using the towel or mat, start rolling the sushi away from you.
When rolled, slice it into 6 or 8 portions, and then serve with pickled ginger, coconut aminos, and wasabi.