Wash the fillet, dab dry and cut into thin slices. Clean, clean and halve the mushrooms. Clean, wash and drain spinach well. Wash lemon, cut into slices.
Peel the garlic and press it through a garlic press. Wash the thyme and remove the leaves from the stalks. Heat 1 tablespoon of oil. Fry the fillet in it for about 4 minutes, take it out. Fry the mushrooms in the pan for about 4 minutes.
Add meat again, season with salt, pepper and thyme. Deglaze with broth, bring to the boil. Heat 1 tablespoon of olive oil. Fry garlic, almonds and lemon wedges briefly. Add the spinach and let it collapse.
Season with salt and pepper and add to the mushroom pan. Whisk the egg yolk and 3 tablespoons of cream. Add the rest of the cream to the pan, bring to the boil again. Alloy with whisked egg yolk. Do not let it boil again.
Season with salt, pepper and mustard and serve in portions.