Cheesy chard gratin

Heat oven to 200c/180cfan/gas6. Strip the chard leaves from the stalks.then cut the stalks into sticks.Bring a pan of water to the boil and cook the stalks for 3-4 mins until starting to soften.then throw in the leaves for a few moments too so that they just wilt drain well

Mix the cream with the mustard then toss through the chard with most of the gruyere.grease a medium gratin dish spread the chard mix over,then scatter with the remaining gruyere and the Parmesan.Bake for 30mins until bubbling and golden.Serve straight from the dish .