Confession: I am Blender Queen. Translation: I am lazy. Anything that can go the blender route should, because it will make my life easier. Thus, this “sauce”/marinade, which is totally delicious and totally yep, easy. You do not need to use the blender. If you prefer, mince the green onion’s whites and whisk the marinade ingredients together in a bowl.
Select a 9″ by 9″ deep casserole dish, or any similar shape. Alternately, use 8-12 clear glass individual dishes.
This filling can be made a day ahead and kept covered in the fridge until ready to assemble casserole. It will require more spreading, and be less runny, if made ahead and chilled.