Toast the slices of bread, take them out and let them cool down. Mix sour cream and barbecue sauce, season with some salt. Cut meat slices in half crosswise, if necessary beat flat between 2 layers of foil on 3-4 mm.
Heat the oil in a frying pan. Fry the meat in it in portions on both sides for 10-20 seconds, season with salt and remove. Peel the pineapple, cut it into 16 slices, cut out the hard stalk in the middle of each slice with an apple cutter.
Spread slices of bread with 1-2 teaspoons of sour cream sauce each and cover with 2 slices of meat and 2 slices of pineapple each. Remove the rind from cheese slices and cover the bread with 1 cheese slice each. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 5 minutes until the cheese has melted.
Remove the breads, arrange on plates, garnish with mint and sprinkle with pepper. Serve with cocktail cherries.