Gratäng med grönkål, purjolök, cheddar och getost

👩‍🍳 Gör så här

1. 1
   Heat the oven to 200C/180C fan/gas 6. Heat the oil in a frying pan or large saucepan over a medium heat and fry the leeks with a pinch of salt for 5-6 mins until softened and beginning to brown. Add the kale and cook for a few minutes until wilted. Remove and set aside.
2. 2
   Either in the same pan or a medium saucepan, add the butter and, once melted, stir in the flour to make a thick paste. Stir in the double cream and mix until smooth, then pour in the milk (you can whisk it if it’s a little lumpy). Once you have a smooth sauce, leave to simmer for a couple of minutes, then remove from the heat and stir in both cheeses until melted.
3. 3
   Mix the leeks and kale back into the cheese sauce, then tip into an ovenproof dish (we used a round 23cm dish). Bake in the oven for 25-30 mins until simmering and golden on top.