Ingredients

• 1 medium onion, chopped
• 1 tablespoon canola oil
• 2 tablespoons ketchup, divided
• 2 tablespoons low-fat mayonnaise
• 2 teaspoons dill pickle relish
• 1 teaspoon distilled white vinegar
• 1-pound lean ground beef
• 2 tablespoons Worcestershire sauce or steak sauce
• ½ teaspoon freshly ground pepper
• 4 sesame-seed or other hamburger buns, toasted
• 4 slices tomato
• 4 leaves green-leaf lettuce

Instructions

• Step 1: Preheat grill to medium-high (or see Stovetop Variation).
• Step 2: Combine onion, oil and 1 tablespoon ketchup in a medium saucepan. Cover and cook over medium-high heat, stirring often, until the onion is softened, 5 to 7 minutes. Reduce heat to medium-low, uncover and cook, stirring occasionally, until very soft, 5 to 8 minutes more. Transfer to a medium bowl and let cool for a few minutes.
• Step 3: Meanwhile, combine the remaining 1 tablespoon ketchup, mayonnaise, relish and vinegar in a small bowl. Set aside.
• Step 4: Add beef, Worcestershire (or steak sauce) and pepper to the onion and gently combine without overmixing. Form into 4 patties, about 3/4 inch thick.
• Step 5: Oil the grill rack (see Tip). Grill the burgers, turning once, until an instant-read thermometer inserted in the center registers 165 degrees F, 4 to 5 minutes per side.
• Step 6: Assemble the burgers on toasted buns with the ketchup-mayonnaise sauce, tomato slices and lettuce.

Tips

• Make Ahead Tip: Prepare ketchup-mayonnaise sauce (Step 3) and refrigerate for up to 1 day.
• Stovetop Variation: Coat a non-stick pan, preferably cast-iron (or a grill pan), with cooking spray and heat over medium-high heat for 1 to 2 minutes. Add burgers, reduce heat to medium and cook, turning once, until an instant-read thermometer registers 155°F (for pork and bison) or 165° (for beef or chicken), 4 to 5 minutes per side.
• Tip: To oil a grill rack, oil a folded paper towel, hold it with tongs and rub it over the rack. (Do not use cooking spray on a hot grill.)

Nutrition Facts 

Per Serving:

378 calories; 16.2 g total fat; 4.7 g saturated fat; 74 mg cholesterol; 540 mg sodium. 557 mg potassium; 31 g carbohydrates; 2 g fiber; 8 g sugar; 26.5 g protein; 2021 IU vitamin a iu; 9 mg vitamin c; 98 mcg folate; 113 mg calcium; 5 mg iron; 39 mg magnesium; 4 g added sugar; 

Exchanges: 

1 1/2 Starch, 1 Vegetable, 3 Lean Meat, 1 Fat

http://www.eatingwell.com/recipe/252379/classic-hamburger/