Soak rolls in cold water. Clean and wash the cauliflower and broccoli and divide into florets. Cook in about 3/4 litre of boiling salted water for about 10 minutes. Peel and finely dice the onion.
Knead minced meat, squeezed out roll, onion, egg, mustard, salt, pepper and peppercorns. Form 12 small meatballs with moistened hands. Heat oil in a pan and fry the meatballs for 6-8 minutes, turning them over.
Drain the vegetables and keep warm. Collect the vegetable water and measure 1/4 liter. Heat 30 g fat in a pot. Sauté flour and 1 tablespoon curry in it. Add milk and vegetable water while stirring, bring to the boil and simmer for about 5 minutes.
Season with salt, curry and broth to taste. Arrange vegetables, sauce and meatballs on plates. Serve dusted with curry.