Lentil & Barley Casserole

Ingredients

• 1 tsp olive oil (optional)
• 1/4 large onion, chopped
• 1 garlic clove, minced
• 1/2 cup carrot, cut into large chunks
• 1/3 cup swede, cut into large chunks
• 1/2 cup sweet potato, cut into large chunks
• A couple of sprigs of rosemary and thyme, finely chopped
• 1 tsp tomato paste
• 2 cups water
• 1/3 cup uncooked brown lentils
• 1/4 cup pearl barley
• 1/2 tsp Massel salt-reduced stock powder
• 75g/2.6oz mushrooms, roughly cut
• Freshly ground black pepper
• 1 cup fresh green beans
• 2 tsp gravy powder