Spicy Mexican Fondue

1 15 1/2 ounce can refried beans
1/2 pound (2 cups) grated Cheddar cheese
2 tablespoons butter
2 tablespoons minced scallion
1 clove garlic, minced
1/2 teaspoon Worcestershire sauce
1 cayenne pepper, seeded and chopped
1 seeded and chopped Anaheim or poblano pepper
3/4 cup beer at room temperature

Combine all the ingredients except the beer in a heavy saucepan.
Heat, stirring, until mixture is heated thoroughly, 10 to 15 minutes.
Add beer gradually, stirring, Transfer to a fondue pot.
Accompany with tortilla chips or fresh vegetables for dipping.