Dab roulades dry, spread with mustard and place 2 slices of bacon on each. Cut cucumbers into strips. Peel onions and cut into slices. Spread cucumber and onion on the roulades. Roll up tightly and pin.
Clean, wash and chop the soup greens. Heat lard in a roaster. Fry the roulades in it for about 5 minutes. Season with salt and pepper. Add soup greens and roast for about 4 minutes. Deglaze with 750 ml water, stir in tomato paste and braise covered for about 1 hour. Remove the roulades. Pour frying stock through a sieve into a pot and bring to the boil. Stir the flour in a little water until smooth, thicken the sauce with it and let it simmer for about 5 minutes.
Add soup greens and roast for about 4 minutes. Deglaze with 750 ml water, stir in tomato paste and braise covered for about 1 hour. Remove the roulades. Pour frying stock through a sieve into a pot and bring to the boil. Stir the flour in a little water until smooth, thicken the sauce with it and let it simmer for about 5 minutes. Season to taste with salt and pepper