Season the pork neck with salt, pepper, chilli and garlic powder and bake in the oven at 180 ° C for about 1 1/2 hours. Let cool down well (overnight if possible) and cut into thin slices.
Brush the bread with butter and mustard. Cut the onions into rings and place on the bread. Cut the pickles into thin slices and also place them on the bread. Place the cut meat over the bread, serve with pickles and a slice of tomato.