Tuna Bake

Ingredients

200g long-grain rice (uncooked weight), cooked.
200g canned tuna.
100g canned corn kernels.
100g cheddar cheese, grated.
200ml milk.
25g flour.
50g butter.
1 tblsp Dijon mustard.
Breadcrumbs.

Method

Preheat oven to 200°C.
First make a white sauce by melting 25g butter in a heavy-based saucepan over low heat, adding flour, and cooking for one minute, stirring constantly to form a roux.
Remove from heat, stir in milk and mustard.
Return to heat, gently bring to the boil, stirring constantly, until thickened.
Grease a casserole dish with some of the remaining butter.
Layer rice, tuna, corn, cheese and white sauce in dish.
Top with bread-crumbs.
Dob remaining butter across crumbs.
Cook casserole in oven for 20min, or until well browned.