In a medium saucepan over low heat, melt the butter and whisk in the flour. Cook, whisking constantly for 2 to 3 minutes, being careful not to brown the flour. Whisk in mustard, Worcestershire sauce, salt, and pepper until smooth. Add beer and whisk to combine. Pour in cream and whisk until well combined and smooth. Gradually add cheese, stirring constantly, until cheese melts and sauce is smooth; this will take 4 to 5 minutes. Add hot sauce. Pour over toast and serve immediately.
Melt butter; remove from heat. Stir in flour and seasonings. Gradually add milk, stirring until well mixed. Cook over low heat, stirring constantly, until thickened and smooth. Cook for 5 minutes longer; add cheese. Stir until smooth and well blended. Serve with pasta or vegetables.
Makes 2 cups.