Mix lemon juice and mustard. Gradually add 2 tablespoons of oil. Wash the cucumber, grate dry and peel in strips. Cut cucumber into fine cubes. Wash, dry grate and halve the tomatoes.
Clean the spring onion and cut into fine rings. Wash the meat, dab dry and cut into 4 medallions. Pluck 1-2 leaves of parsley and cover medallions with them. Heat 1 tablespoon of clarified butter in a frying pan and fry the medallions all around.
Fry over medium heat for 8-10 minutes. In the meantime, peel the garlic and press it through a garlic press. Heat 1 tablespoon of oil in a wide saucepan. Sauté the spring onion, garlic and bell pepper in it.
Deglaze with broth. Sprinkle in couscous and leave to soak for 2 minutes. Simmer over low heat for 3 minutes. Meanwhile wash parsley and shake dry. Pluck the leaves from the stalks and chop finely.
Add vinaigrette to the couscous and mix. Season to taste with salt and pepper. Carefully fold in tomatoes, cucumber and parsley. Arrange couscous and pork medallions on plates.