Wash and clean the apple, cut out the middle, cut into slices. Cut sausages into slices and fry in fat until golden brown, remove, brush with mustard. Cut into slices and pickles. Peel onions cut it into small slices and fry in a pan in which grilled sausages. Skewered sausages, onion, cucumber and apple on skewers, put on a baking sheet, top with slices of cheese and bake under the grill to melt the cheese.