This recipe is a great comfort dish and takes me back to my time as a kid when my mother used to do a good home roast with mash potato and this is a lighter simpler version, it's a great way to get kids to try a version of starch & carbs, that you can then add any extra veg like peas, shredded cabbage or kale to, and even fresh herbs like parsley, thyme, mint or chives. You can then adapt it how you like and even make the polenta vegetarian by adding a veg stock instead of chicken stock and serving with a veggie protein.
Combine the oil (120ml), herbs and garlic and coat the lamb in this mixture. Leave these to marinate for a day before cooking, take out of the fridge for an hour before use so they are at room temperature.
Place a shallow frying pan on a medium heat, add the remaining olive oil, season the rumps and add to the pan, colour them all over, adding a little butter (about 10g) after approximately 4-5 minutes. Once sealed and golden brown, place into the oven at 170C/gas 3. These will then take approximately 8-10 minutes to cook to medium rare, depending on the size. Once they are cooked let them rest for 3 minutes, and then slice them thinly. While they are resting, add the peas and spinach (and kale or cabbage if using) to the pan, and cook until peas are soft and cooked and the spinach is wilted.
For the polenta, put the chicken stock, salt and rosemary into a pan and bring to a simmer, then slowly whisk in the polenta until it starts to thicken & add the olive oil. Cover with a sheet of greaseproof paper and leave to the side of the stove or cook on a very low heat. This will take approximately 15 minutes to cook, stir every few minutes – if it gets too thick then add a little more stock. Place a small sauté pan on a low heat, add a little olive oil and the spring onions with a little salt and pepper, and cook for no more than 2 minutes. Then add this to the polenta and then the Parmesan cheese and yogurt. Check the seasoning and serve with the lamb and green vegetables.