Peel 2 onions and cut into rings, cucumbers into slices. Wash and quarter the apple and remove the core. Cut quarter into slices. Whip crème fraîche and sour cream lightly. Stir in onions, gherkins and apple. Rinse the matie fillets briefly under cold water and dab dry with kitchen paper. Add to the cream sauce, season with a little salt and pepper and arrange in a herring pot
Wash the potatoes and cook covered with boiling water for about 20 minutes. Drain, quench and let cool down a little. Cut bacon into cubes. Peel and chop the remaining onion.
Peel and slice the potatoes. Heat oil in a pan and fry potato slices until golden brown. Add bacon and onion and fry briefly. Arrange potatoes and maties on plates and garnish with parsley and apple