Cut top from pumpkin; discard top. Remove and discard strings and
seeds. Place whole pumpkin, minus top, in baking dish. Add about
1 inch hot water to dish around the outside of the pumpkin. Cover
pumpkin and pan with foil.
Bake in a preheated 400 degrees F oven
for 45 minutes, or until pumpkin is tender but not falling apart.
Pour off water.
Season inside of pumpkin with salt and pepper. Spread with 1 tablespoon
of the mustard and sprinkle with brown sugar.
Combine remaining 2 tablespoons mustard, egg, Worcestershire sauce,
salt, ground beef and bread crumbs. Mix well. Spoon beef mixture
into pumpkin shell, packing down tightly.
Return pumpkin to oven
and bake, uncovered, for 45 minutes to 1 hour, or until pumpkin
is tender and meat loaf is cooked.