Heat a grill pan over medium-high heat. Combine first 5 ingredients in a medium bowl. Divide mixture into 4 equal portions, shaping each into a 1/2-inch-thick patty. Add patties to pan; cook 4 minutes on each side or until desired degree of doneness. Remove patties from pan. Add tomato slices to pan; cook 1 minute on each side. Spread about 3/4 teaspoon mustard over bottom half of each roll; top each with 1 lettuce leaf, 1 patty, 1 tomato slice, and top half of roll.
Good, solid burger recipe - can definitely taste the thyme in these, but they are quick and easy to make. Used an indoor cast iron grill pan for the burgers and had to increase cook time to ~10 / side. I would consider adding smoked paprika to the recipe next time to get that "grill" flavor if cooking again during colder months and can't use the outdoor grill. Otherwise, good "fall back" recipe for indoor burgers; enjoy!
When I grill burgers, I usually want just a straight-forward burger with nothing more in the meat than salt and pepper. But I tried this to appeal to a picky eater who I thought might say the grass-fed beef tasted strange. Not only did she gobble it up and not complain, but also I think I may have found an easy way to make a more distinctive burger that will still go with many toppings.
This was a flavorful burger that I would make again any night of the week. The garlic outdid the thyme flavor but I also substituted 1 tsp dried thyme for the fresh so that might have effected it. The grilled tomato adds a smoky sweetness that I would try for other burgers as well. Husband loved it. Served with oven fries, makes a great meal.
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