For the meatballs, peel and finely dice the onions. Knead minced meat with onions, tomato paste, breadcrumbs and 2 eggs. Season with salt and pepper. Fry about 40 balls out of it. Heat the oil in portions in a large pan. Fry the balls in the oil in portions all around for about 8 minutes. Take them out and put them into a large bowl. Pour barbecue sauce over the hot balls and mix everything. Let it cool down.
For the salad, hard-boil 4 eggs. Then rinse with cold water, peel and let it cool down. Clean, wash, drain and cut the salad into strips. Wash, clean and slice the cucumber. Wash and halve the tomatoes. Dice eggs. Mix salad cream, milk and vinegar until smooth. Season with pepper. Coarsely grate the Gouda.
Alternately layer prepared salad ingredients, meatballs with sauce and salad cream in a large glass. Keep cool until serving. Just before serving, spread potato sticks on top.