How to make lentil, beef and mushroom stew

400g button mushrooms 600g beef 2 tbsp olive oil 1 onion, chopped 3 garlic cloves, crushed 2 large carrots 3 rosemary stalks 1 bay leaf 2 tbsp balsamic vinegar 2 tbsp tomato paste 1 can chopped tomatoes 400ml beef stock (or water) 400g can...

How to make lentil, beef and mushroom stew
400g button mushrooms 600g beef 2 tbsp olive oil 1 onion, chopped 3 garlic cloves, crushed 2 large carrots 3 rosemary stalks 1 bay leaf 2 tbsp balsamic vinegar 2 tbsp tomato paste 1 can chopped tomatoes 400ml beef stock (or water) 400g can green lentils