Set aside a tablespoon of the sweetcorn, place the rest in a blender along with the cannellini beans, sour cream and half lime juice then blend it all up.
Add the coriander, sugar, salt, garlic puree, ground turmeric, cayenne chilli powder and a fresh red chilli. Blend again until everything is smooth and a nice consistency.
Add the chopped pepper and sweetcorn and stir into the dip. Season with black pepper to taste. Chill in the fridge until ready to serve.