This is a tasty savoury side dish or vegetarian main course made with instant polenta, sweetcorn and spring onions baked in a cheesy batter. It gets a nice kick from the ground mustard but you could serve it with a homemade tomato sauce too.
Boost the vegetable content by adding diced steamed carrots, sliced leeks or frozen peas (no need to thaw).
If you can't find buttermilk, you can substitute semi-skimmed milk mixed with 1 teaspoon lemon juice. Leave it to stand for 5 minutes before using.