Country onions, also known as rondelles in Cameroon, are an aromatic heritage spice rather than ordinary bulb onions. Their earthy, garlicky character pairs especially well with fish and shellfish.
Add the seafood in stages. Crab and firm fish require more cooking time, while shrimp and mussels should enter near the end to keep them tender.
Serve warm with boiled plantains, yams, cassava, cocoyams, rice, bobolo or miondo.