500g/1lb 2oz rump steak, thinly sliced2 large crusty rolls or buns2 tablespoons olive oilCos lettuce leavesSaltFor the marinade:1 onion, thinly sliced1 garlic clove, chopped1 small dried chilli, crushed1 bay leaf, broken up1 tablespoon chopped parsley1 teaspoon dried oregano2 tablespoons red wine3 tablespoons olive oilFreshly ground black pepper