Turnip, potato & mustard gratin

Method

• step 1

  Fill a saucepan with 500ml water, the milk, a good pinch of salt and a grinding of black pepper, then bring to the boil. Add the turnips and potatoes and cook for 2 mins. Strain, drain well and pat dry.

• step 2

  Heat oven to 180C/160C fan/gas 4. Butter a baking dish and rub the sides with garlic to just add a hint of flavour. Mix the cream and mustard in a large bowl, add the potatoes and turnip, mix until well coated and season really well. Layer into the baking dish, flattening the top level. Can be assembled and chilled a day ahead.

• step 3

  Bake for 30-40 mins or until golden brown and the turnip and potato are cooked through – check with the point of a sharp knife.