Preheat the convection/fan oven to 180 °C. Mix 500 g cooked sushi rice with 2 tablespoons sushi vinegar and 2 tablespoons sesame oil. Spread evenly in the bottom of a baking dish, pressing gently to form the base.
Cut 350 g salmon into pieces and place in a separate ovenproof dish. Bake for 10–15 minutes, until cooked through and the flesh flakes easily. Let it cool before mixing, then remove and discard the skin and check for bones.
Increase the oven temperature to 200 °C. In a large bowl, combine 120 g cream cheese, 2 tablespoons sour cream , 2 tablespoons mayonnaise, and 2 tablespoons sriracha sauce. Add the cooled salmon and 300 g imitation crabmeat, finely chopped. Mix gently until evenly combined, keeping some texture in the fish.
Scatter 250 g seaweed snacks over the rice. Spread the salmon and crabmeat filling evenly over the seaweed layer.
Distribute 30 g lumpfish caviar (roe) over the filling. Bake at 200 °C for about 10 minutes, until heated through and the edges are lightly golden.
Allow the bake to cool for a few minutes before cutting into six portions and serving warm.
Notes
Cooked rice weight: Weigh the rice after cooking. The listed 500 g is not a dry-rice measurement.Oven settings: Both temperatures are fan/convection settings. The recipe uses a lower temperature for the salmon and a higher temperature for the assembled bake.Serving seaweed: Any extra seaweed sheets served alongside are additional to the amount used inside the bake.Leftovers: Refrigerate in a covered container for up to two days.