Wash the lemon hot, grate dry and finely grate the peel. Halve the fruit and squeeze the juice. Peel and halve onion and cut into fine strips. Wash the thyme, shake dry, remove the leaves from the stalks, except for a little garnish.
Mix onion, lemon peel, lemon juice, thyme and mustard, season with salt and pepper. Stir in 4 tablespoons of oil drop by drop. Wash the meat, dab dry and cut crosswise into thick strips
Heat 1 tablespoon of oil in a pan, roast pumpkin seeds briefly in it, take out. Fry meat in the hot pan while turning for 8-10 minutes. Wash spinach and cress, shake dry, pluck cress leaves from the stalks
Mix spinach, cress and onion mixture. Arrange salad and chicken strips, sprinkle with pumpkin seeds and garnish with thyme