Cook the potatoes and peel them (see page 62 Fig. 1-4). Slice the potatoes warm. In the meantime, dissolve stock in 400 ml hot water. Peel onions, dice finely and sauté in 1 tbsp. hot oil for approx. 3 minutes. Sprinkle with 1-2 tsp.
sugar, caramelise slightly. Add stock, mustard, vinegar and 2 tablespoons of oil. Season to taste with salt and pepper. Pour hot over the potatoes, mix carefully. Leave to stand briefly.
Wash the cucumber and slice or cut into fine slices. Wash chives, shake dry and cut into small rolls. Mix cucumber and chives into the salad. Is traditionally eaten with fried Maultaschen or meat cakes (meatballs).