A Hamdun cocktail party standby!
Thinly slice 2 large red onions. Cover with 1 cu sugar and 2/3 cu water. Let stand over night. Drain. Add sour cream to just moisten, about 2-3 tbsp. Serve with Ritz crackers.
Find it online: https://www.hamdun.org/blog/catherines-onions/