Prepare a small bowl of vinegar - water solution (1 Tbsp vinegar for 1 cup of water), use this to dip your hand.

Slice your fish or topping of choice into 2 1/2 x 1 " thin rectangle.

Pluck some cooked sushi rice, about 25g, have it in the middle of your left palm.

Use your thumb to keep rice steady when applying pressure and mold sushi rice into oval/oblong shape.

Dab a pea size of wasabi onto fish slice, then put the shaped rice on top.

Gently squeeze your hand to fold them together.

Repeat for more nigiri and serve them fresh