Squeeze the garlic cloves. Crush black peppercorns in a mortar. Rub the lamb fillets with the garlic, salt, pepper and thyme. Fry in a pan with olive oil, deglaze with red wine and fry on a low heat for about 10-15 minutes. Finally stir in the creme fraiche.
Simple and delicious, especially with rataouille, beans or spinach.