Lentil and walnut casserole | Visit Ljubljana

Ingredients

• 200 g brown lentils
• 150 g brown mushrooms
• 150 g walnut kernels
• 3 tablespoons flaxseeds
• 2-3 carrots
• 2 stalks of celery
• 2 teaspoons olive oil
• 1 small onion
• 1 grated apple
• Handful of oat flakes
• Dried thyme
• Salt and pepper
• Breadcrumbs, if needed
• Olive oil and tomato paste, for brushing