Ingredients:

• 2 lbs sirloin tip, cut in 1/8" thick slices
  
• 1/2 cup peeled fresh lemongrass, chopped
  
• 1/3 cup shallots, chopped
  
• 2 tablespoons Vietnamese fish sauce (otherwise known as "Nuoc mam" or "Nam pla")
  
• 1-1/2 tablespoons sugar
  
• 2 teaspoons vegetable oil
  
• 6 medium-sized garlic cloves, smashed
  
• 2 serrano chiles, seeded and chopped
  
• Low fat cooking spray

Directions:

1. In a food processor, combine lemongrass, shallots, fish sauce, sugar, oil, salt, garlic and chiles. Process for 1 minute or until smooth.
   
2. In a small bowl, add beef and lemongrass mixture and stir to coat evenly. Cover bowl with plastic wrap and marinate in the refrigerator for about 2-3 hours.
   
3. Prepare grill. Remove beef from bowl and discard extra marinade. Coat the grill with low fat cooking spray then grill the beef on each side for about 1 minute or until desired doneness.