Gently soften the diced onion in the sunflower oil in a big pan or casserole.
Meanwhile, whizz together the roughly chopped onion, ginger, coriander stalks and jerk seasoning with a hand-held blender. Add to the softened onion and fry until fragrant. Stir in the thyme, chopped tomatoes, vinegar, sugar and stock cubes with 600ml water and bring to a simmer. Simmer for 10 mins, then drop in the sweet potatoes and simmer for 10 mins more. Stir in the beans, peppers and some seasoning, and simmer for another 5 mins until the potatoes are almost tender. Cool and chill for up to 2 days.
To serve, gently heat through on the hob. Roughly chop most of the coriander leaves and stir in, then serve scattered with the remaining leaves.
2 onions, 1 diced, 1 roughly chopped
2 tbsp sunflower oil
50g ginger, roughly chopped
small bunch coriander, leaves and stalks separated
3 tbsp jerk seasoning
2 thyme sprigs
400g can chopped tomatoes
4 tbsp red wine vinegar
3 tbsp demerara sugar
2 vegetable stock cubes, crumbled
1kg sweet potatoes, peeled and cut into chunks
2 x 400g cans black beans, rinsed and drained
450g jar roasted red peppers, cut into thick slices