Beef Fajita Marinade II

• 12 ounces beer (not lite beer)
• 1 cup canola or olive oil
• 1 small white onion, sliced
• 1/4 cup fresh lime juice
• 4 large garlic cloves, crushed
• 2 tablespoons Worcestershire sauce
• 1 tablespoon chili powder
• 1 teaspoon ground cumin
• 3 dried chiles de arbol, seeds and stems removed, crushed
• 1 teaspoon freshly ground black pepper