Hmm. Sounds a bit like something my mother used to make. Kind of a version of Chicken and Dumplings. Flaked canned salmon in a white sauce in a casserole dish. Biscuit dough patted out and shredded cheese spread over. Rolled up and then sliced and placed cut side down (and up) on top of salmon mixture and baked. I don't remember any particular seasonings/additions like onions, green pepper added to the white sauce other than salt and pepper.

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