Preheat the oven to 200°C.
Peel your potatoes and cut them into quarters. See note*
Bring to a boil in salted water and cook for 15 to 20 minutes until the potatoes are soft.
Fry the onion and pepper in olive oil till translucent.
Add garlic, herbs, mushrooms and mixed vegetables and stir-fry for 5 minutes.
Add tomato paste, chutney and stock and let simmer for 5 minutes.
Season to taste and add the lentils. Let the mixture simmer while you make the mashed potatoes.
Drain the potatoes and add butter and milk. Replace the lid of the pot and give the butter chance to melt and the milk to warm up. Mash the potatoes until smooth and silky. Season with salt and pepper to taste.
Transfer the lentil filling to a greased oven dish. Top with mashed potatoes and make some interesting patterns on top with a fork. Bake for 25 - 30 minutes until golden and crispy at the edges. Serve with steamed broccoli or a side salad.