Wash, dry and halve the lemon. Squeeze one half and cut the other into slices. Mix salad cream, sour cream, mustard and lemon juice. Season to taste with salt and pepper.
Cut bread into small lozenges. Wash the meat, dab dry and cut into strips. Heat oil in a pan and fry meat until golden brown all around. Season with salt and pepper and remove.
Roast the bread in the frying fat until golden brown. Take out and let drip off on kitchen paper. Clean and wash the salad and cut into wide strips. Wash, clean and halve the tomatoes. Mix lettuce, tomatoes and meat.
Drizzle gravy over it. Sprinkle with croutons and parmesan. Garnish with lemon slices.