Guinness & Onion burgers

This recipe came from The Little Black Book of BBQ. Simple and delicious. We used Guinness, though I think any dark beer would work well. Served on a fresh ciabatta roll topped with onions and mustard, a side of sliced sweet potatoes that we grilled with some olive oil and salt, and some kettle chips, made for a perfect Sunday dinner.

Ingredients

• 2 beef burgers
• 3 ounces Guinness (or any dark beer)
• 1/4 cup diced red onion
• 1 tsp olive oil
• dash of salt
  

Directions

1. Dice red onion and place in food processor with Guinness, olive oil and salt. Puree until smooth and liquidy.
   
2. Liberally baste burgers on one side with marinade. I use a fork to poke holes in the burger so the beer mixture seeps in a bit more.
3. Place burgers on grill, marinade side up. Grill 2-3 minutes, flip, and brush other side liberally with remaining marinade. Discard any leftover marinade. Continue cooking until burgers are done to your liking.