Hard boil eggs (about 9–10 minutes)
Cool, peel, and separate whites from yolks
important:
Keep yolks whole—you’ll grate them later

Build the Mustard Sauce
Melt butter Stir in flour,
cook 1–2 minutes (no color)
Slowly whisk in milk Let it thicken to a light sauce.
Now add: mustard vinegar or lemon
salt & pepper
tiny pinch sugar (optional)
Taste: should be tangy,
slightly sharp, but rounded
Add the Egg Whites
Chop egg whites into large pieces
Gently fold into the sauce
Warm through (don’t overcook)

In the casserole dish, add toast and asparagus

Spoon into a shallow casserole dish or you can bake
in a large dish if you want to brown the top.

Brown under the broiler for a few minutes.

Grate the yolks over the top (like parmesan)

Finish with: parsley or chives black pepper
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