2 bunches chard leaves, chopped (about 8 cups packed or 2lbs)
1 cup water
1 Tbsp vegetable oil
1 Tbsp (½ oz/14gr) butter
1½ cups milk
3 Tbsps flour
1 Tbsp + 2 tsps wholegrain mustard
1½ cups grated Gruyère (6.3oz/180g)
Sea salt and black pepper
¼ cup grated Parmesan cheese (0.8oz/22.5g)
2 to 3 Tbsps bread crumbs
1 cup water
1 Tbsp vegetable oil
1 Tbsp (½ oz/14gr) butter
1½ cups milk
3 Tbsps flour
1 Tbsp + 2 tsps wholegrain mustard
1½ cups grated Gruyère (6.3oz/180g)
Sea salt and black pepper
¼ cup grated Parmesan cheese (0.8oz/22.5g)
2 to 3 Tbsps bread crumbs
SERVE WITH
Crusty bread
- Preheat oven to 350°F.
- Bring a saucepan of salted water to boil.
- Thinly slice the reserved chard stems, add them to the water, and cook for 2 minutes. Add the leaves and continue cooking until tender, about 3 to 4 minutes longer.
- Drain and allow to cool, then gently squeeze out the excess liquid and coarsely chop.
- In a large pan heat oil and butter over medium heat. When butter has melted, whisk in the flour until blended and whisk until the flour cooks, or starts to brown.
- Slowly whisk in the milk. Continue cooking and stirring until the sauce thickens, 3 to 5 minutes. Season with salt and pepper and stir in the mustard and the Gruyère.
- Stir in the cooked chard and transfer to a buttered gratin dish.
- Sprinkle with the Parmesan and breadcrumbs.
- Bake for 20 minutes or until hot and bubbling.
- Put under the broiler to get the top brown and crispy.
- Put the hot potatoes onto a plate and spoon the gratin over them.
- Serve immediately.