Roast Elk Steak recipe

At Fort Clatsop 1806

2 lb elk round steak, cut 1/2 inch thick
1/2 cup all purpose flour
2 tbsp dry mustard
1 tsp salt
1/2 tsp ground black pepper
2 plum tomatoes -- 28 ounce size, diced
2 tsp garlic, minced (2-3 cloves)
2 medium size onions, peeled and sliced thickly
1/2 cup finely chopped celery
2 tbsp Worcestershire sauce
oil or fat for frying