Mushroom and Lentil Meatballs | BOSH!

Ingredients

• 2 tbsp olive oil
• 1 onion
• 250g chestnut mushrooms
• 3 cloves of garlic
• 1 tbsp tomato purée
• 4 sprigs of thyme
• 1 sprig of rosemary
• 1 tbsp red wine vinegar
• 1 tbsp soy sauce
• 50g walnuts
• 1 400g tin of - black beluga lentils
• 1 tbsp nutritional yeast
• 1 lemon
• 10g fresh parsley
• 3 tbsp plain flour