If spontaneous back-garden barbies with a few friends and family are more your style, you won’t want too much preparation or washing up to do. Buying a few sausages and throwing them on to sizzle is all well and good, but with minimal effort you can create delicious, light barbecue meals, so follow our advice on choosing your meat or fish, finding the right side dishes and knocking up no-cook sauces which won’t pile on the weight