Lentil shepherds pie is a big favourite with my DDs. My recipe changes every time I make it depending on what we have in the fridge, but is ususally red lentils, onion, carrot, frozen peas and/or sweetcorn, chopped peppers. I normally add some crushed chillies and Marigold stock powder. He could make a batch and freeze it. Add cheese and milk to the topping for calcium and added protein.
Veggie sausages, potato wedges, or chips or mash and baked beans. I like quorn suausages but my DDs really like Tesco leek and cheese sausages (chilled section)
Baked potato, cut open and filled with Discovery Refried Beans (in a can) or baked beans topped with cheese and back in the oven for about 20 minutes.
Vegetable chilli served with Tacos, salad and cheese.
Pasta bake with onion, peppers, passatta and/or canned tomatoes. Cover with mozzarella and bake.
Home made pizza. If you don't want to make a base, use ciabatta bread for the base.
Vegetable Lasagne - I rarely bother with a white sauce which makes it easier Sometimes I put lentils in it and sometimes just vegetables.
Lentil and vegetable soup - served with crusty bread to make it more filling.