Beer & Cheddar Fondue

2-1/2 cups extra sharp cheddar, grated
1-1/2 cups swiss, grated
1 tablespoon flour
1 bottle beer
1/2 tsp Worcestershire sauce
1/2 tsp dried mustard
few drops of Tabasco sauce

Combine cheeses and flour in a bowl and set aside. Bring beer to a slow boil over medium heat. Reduce heat to a simmer. Slowly stir in cheese mixture; stirring constantly. Once cheese is fully melted add in Worcestershire sauce, mustard, and Tabasco. Transfer to a warmed fondue pot.