Instructions

1. Preheat grill pan on stovetop over medium-high heat. Cook patties 5 to 6 minutes per side or until no longer pink.
2. Sauté mushrooms and thyme in 1 Tbsp hot oil in skillet 8 minutes or until mushrooms are browned.
3. Arrange lettuce in 6 stacks. Top with burgers and mushrooms. Stir together mayonnaise and mustard; serve with burgers.
4. Preheat oven to 425°F. Combine beets and 2 Tbsp oil on a large rimmed baking sheet; sprinkle lightly with salt and pepper.
5. Bake 25 minutes or until beets are browned and tender; cool slightly.
6. Whisk together 2 Tbsp oil, lemon juice, shallot, mustard, and honey in a bowl. Add watermelon, basil, and beets; toss.