Mushroom stroganoff

Name: Mushroom stroganoff
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: European, Eastern European
Ingredients: 1 brown onion, cut into quarters; 2 garlic cloves; 40 g oil; 3 tsp Vegetable stock paste (see Tips); 50 g tomato paste; 40 g white wine; 2 tsp plain flour; 1 tsp paprika; 20 g lemon juice; 4 fresh portobello mushrooms, cut into slices (1 cm); 400 g fresh Swiss brown mushrooms, cut into quarters; 100 g fresh shiitake mushrooms, cut into quarters; 100 g sour cream; 2 - 3 sprigs fresh flat-leaf parsley, leaves only, for garnishing