Grilled Burgers with Meyer Lemon Butter

This burger recipe is from Bon Appetit and was really good. A nice change from the typical grilled burger and the butter made the burger extra moist. I liked the subtle lemon flavor throughout the burger and the surprise lemon pop in the center. I, sadly, did not find Meyer lemons at my store so just used regular.

Grilled Burgers with Meyer Lemon Butter
6 tablespoons butter, room temp
1 tablespoon finely chopped fresh tarragon
1 tablespoon finely chopped fresh basil
1 tablespoon finely chopped fresh Italian parsley
1 teaspoon fresh Meyer lemon juice or regular lemon juice
1 teaspoon finely grated Meyer lemon peel or regular lemon peel
1.5 pounds ground beef (15% fat) - I used a little over 2 pounds
Hamburger buns
Toppings: sliced onion, lettuce, tomato, etc.

Mix butter, all herbs, lemon peel, and lemon juice into bowl. Season with salt and pepper. Measure out 1/3 cup butter; transfer to sheet of plastic wrap (leave the rest in the bowl for spreading on buns). Using plastic wrap as aid, form butter into 3 inch log. Wrap to seal and place in freezer until firm, about 30 minutes. Cut crosswise into 4 rounds. Fatten rounds into 2 inch diameter discs.

Divide meat into 4 equal parts (I made 5 patties). Form each piece into a ball. Using thumb, made deep wide indentation in center of each ball. Press 1 lemon-butter round flatly into indentation, then press meat securely over butter to enclose. Flatten each burger into 3.5 inch diameter patty, leaving butter rounds horizontally in center of each burger.

Brush grill with oil (or spray) and bring to high heat. Sprinkle both sides of the burgers with salt and pepper. Spread remaining butter over cut sides of the buns. Grill burgers until cooked through, 4-6 minutes on each side. Grill buns until slightly charred, about 1 minute per side.