Step 1

Heat the oil over medium heat in a large saucepan. Add the onions and cook about 10 minutes until translucent. Add the garlic and cook for 1 minute then pour in the beer and let it simmer for 2 minutes to burn off the alcohol.

Step 2

Stir in the rest of the ingredients. Cook uncovered over medium heat for 20 to 3 0 minutes to concentrate the flavors.

Step 3

Remove the saucepan from the heat and allow the sauce to cool down for 15 minutes or until no longer steaming hot. Working in batches, pour the sauce into a blender and puree until smooth (alternatively, you can use a stick blender and blend it right in the saucepan).