Soak bread in lukewarm water. Peel and finely dice the shallot. Put minced meat, shallot, mustard and egg in a bowl. Squeeze the bread well and add it. Season strongly with salt and pepper and knead well.
Form meatballs from the mass. Heat 1 tablespoon of oil in a frying pan and fry the meatballs for about 12 minutes at medium heat. Peel, wash and halve the potatoes. Heat 2 tablespoons of oil in a frying pan and fry the potato halves until golden brown.
Wash parsley and thyme, dab dry and chop finely. Clean and wash spring onions and cut into fine rings. Melt the fat in a pot, add the flour and sauté for about 1 minute while stirring.
Deglaze with broth and milk, stirring constantly. Bring to the boil and simmer at medium heat for about 10 minutes, stirring from time to time. Stir in herbs, lemon juice and zest, season with salt and pepper.
Add the meatballs to the sauce and warm them up. Arrange in a bowl and sprinkle with spring onion rings. Arrange with the potatoes on a plate and sprinkle with coloured pepper.