Salisbury Steak with Mushroom Gravy

INGREDIENTS

1 lb

ground beef

1/2 cup

finely chopped celery (OR use shredded and squeezed zucchini, or drained defrosted chopped spinach)

1/2

green pepper (finely chopped)

1/4 cup

oat bran

large egg

1 tsp

prepared mustard

1 tsp

dried parsley

1/2 tsp

dried onion powder

1/4 tsp

fine sea salt

3 tbsp

butter (divided)

1/2 lb

brown button mushrooms (sliced)

1 1/2 cups

beef stock

1 tsp

Worcestershire sauce

1/2 tsp

dried onion powder

1 tsp

Glucomannan (you can also use 1 tablespoon starch instead, but it will have more carbs)