French Dip Sandwich

Ingredients:
1 3.5lb Rump Roast
1 Tbsp of Dry Italian Seasoning
2 Yellow Onions, sliced
8 Cloves of Garlic, chopped
2 cups of Beef stock
1 cup or a 12 oz Dark beer
2 Tbsp of Worcesteshire sauce
2 Tbsp of Soy Sauce
2 Tbsp of Dried Onion Flakes
2 Tbsp of Vegetable oil
Salt and Pepper, to taste

For the horseradish sauce:
1/2 cup of Mayo
1/4 cup of Sour cream
1 Tbsp of Prepared Horseradish (or more), to taste
2 Tbsp of Chopped Chives
1 Tbsp of Whole Grain Mustard
2 tsp of Dijon Mustard
Dash of Worcesteshire Sauce

Remaining Ingredients:
6 8 inch Crusty Rolls
Sliced Provolone Cheese