1/3 cupextra-virgin olive oil3Spanish onions, very thinly sliced using a mandolin2 tbspgranulated sugar1 tspdried chilli flakes1 tspcumin seeds1 tspcaraway seeds1 tspwhole cloves¼ cupred wine vinegar
Heat extra-virgin olive oil in a large heavy-based frying pan, add onions and cook over medium heat for 10 minutes or until soft, stirring occasionally. Add sugar and cook, stirring frequently, for another 10 minutes. Stir in spices and cook for 5 minutes, then add vinegar and cook for another 5 minutes or until dark and thickened. Cool, then refrigerate until ready to use. Onion relish will keep refrigerated in an airtight container for up to 2 weeks.