Ingredients:
- 5 shallots, very thinly sliced
- Canola or vegetable oil, for frying
- Kosher salt
- Kosher salt and freshly ground pepper
- 2 pounds haricots verts or thin green beans, ends trimmed
- 2 tablespoons butter, plus more for buttering the casserole
- 1 pound mushrooms (any kind of mushrooms, button, cremini, wild, whatever you like), wiped clean and roughly chopped
- 3 shallots, minced
- 3 tablespoons all-purpose flour
- 2 cups chicken or vegetable broth
- 1 cup half-and-half
- Fresh parsley or chervil, to garnish, optional
