Chili Con Queso

From Budweiser cookbook

1 medium onion chopped
3 Tbsp butter
3 Tbsp flour
1 tsp salt
1 C heavy cream
1/4 C Budweiser
1 (16oz) can tomatoes, drained and chopped
1 (4oz) can diced chilies, drained
8oz Monterrey jack cheese, cubed

Saute onion in butter until tender. Stir in flour and salt. Cook, stirring constantly, until bubbly. Remove from heat. Stir in cream. Cook, stirring until sauce thickens and begins to bubble. Stir in beer, tomatoes and chilies. Cook 1 minute. Add cheese, stirring constantly until melted