Make the eel sauce. Combine all ingredients in sauce pan and cook on medium 5-7 minutes until it starts to thicken. It will thicken more as cooking.
Place cubed salmon in a bowl with cream cheese and 3tbsp of eel sauce. Mix together.
Layer pan. Sushi rice, salmon mixture, top with sesame seeds. Bake in oven for 12-15 minutes.
Top with spicy mayo, rest of eel sauce, cucumber mixture and serve! Can top with avocado as well!!