Quick Beef Stroganoff - Petites Choses

Ingredients

• 600 g beef filet, cut into strips
• 1 large red onion, thinly sliced
• 2 garlic cloves, crushed
• 500 g brown mushrooms, quartered
• 400 g sour cream (crème fraîche)
• fresh thyme sprigs
• 1-2 tbsp soy sauce
• salt flakes freshly cracked
• freshly cracked black pepper
• 1-2 tsp truffle paste (optional)
• 2 tbsp butter
• olive oil