While you won’t be able to wholly recreate the taste of curries made using pastes freshly bashed in Asian markets, a shop-bought curry paste isn’t the worst place to start a recipe and the aromatic ingredients that lurk in those jars can be brought to life with heat, fish sauce and lime juice. For those lacking in the knife skills department, cumbersome vegetables like butternut squash can be bought from supermarkets pre-prepared. Kaffir lime leaves are an exotic ingredient but can be found in most Asian stores and freeze wonderfully – you can just pick out a handful and add them straight to a soup like this. If you can’t find them, add the zest of a lime while you fry off the curry paste.