Chicons au gratin végétariens: tender braised Belgian endives baked in a rich, velvety nutmeg-infused Mornay cheese sauce under a bubbly golden crust of grated Chimay cheese.
Gently press the braised endives between sheets of kitchen paper to remove excess moisture so the gratin stays rich and velvety.
Melt butter in a saucepan, whisk in flour for 1 minute, then gradually whisk in the milk until a thick béchamel forms. Stir in two-thirds of the grated cheese, nutmeg, cayenne pepper, salt, and pepper.
Lay the braised endives in a buttered gratin dish. Pour the warm cheese sauce over the endives until completely enveloped.
Top with the remaining grated cheese. Bake at 200°C (180°C fan) for 20 minutes until the sauce is vigorously bubbling and the cheese is deeply bronzed and crusty.