Drain the cucumbers on a sieve and chop them finely. Peel and finely dice the shallots. Bring the cucumbers, shallots, vinegar and sugar to the boil while stirring and boil down for about 10 minutes. Wash and clean the chillies, cut them in half lengthwise, remove the seeds.
Finely chop the pods. Season the relish with chilli and salt.
Peel, wash and slice the potatoes. Coarsely grate the cheese. Mix potatoes and cheese and season with salt. Spread flat on a baking tray lined with baking paper. In a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see
manufacturer) bake for about 40 minutes until crispy. Turn with a spatula in between.
Peel the onions. Dice 1 onion. Knead minced meat, diced onion, breadcrumbs, 4 tablespoons of water, egg and mustard, season with salt and pepper. Shape into 4 meatballs. Heat the oil in a pan and fry the meatballs for about 15 minutes, turning them over.
Cut the remaining onions into rings. Remove the finished meatballs and keep warm. Put the onion rings into the pan and braise in the meatball fat for about 5 minutes. Season with salt and pepper. Arrange potatoes, meatballs, onion rings and cucumber relish.