Greek Diner Burgers on the Grill

Wash and dry all produce. Zest lemon, then cut into quarters. Halve, peel, and thinly slice shallot. Heat a grill over direct heat and brush grates with 2 tsp oil. TIP: If cooking indoors, heat a drizzle of oil and 1 TBSP butter in a grill pan or large pan over medium-high heat.

Add patties to grill or pan and cook until marks appear on bottom, 7-8 minutes. Flip and cook until marks appear on other side, 6-7 minutes more. Transfer to a plate. Meanwhile, mix together sour cream, a drizzle of olive oil, remaining Mediterranean spice blend, and remaining feta cheese in a small bowl. Set aside.

Trim cucumber ends, then quarter lengthwise. Cut crosswise into ½-inch pieces. Quarter tomatoes, then dice into ½-inch pieces. In a medium bowl, toss together cucumbers, tomatoes, half the shallot (add more for extra onion-y flavor), lemon zest, juice from two lemon quarters, 1 tsp mustard (we sent more), a large drizzle olive oil, and 1 tsp sugar. Season with salt and pepper.

Microwave 1 TBSP butter in a small, microwave-safe bowl until melted, about 20 seconds. Split buns in half and brush cut sides with melted butter. Place on grill or in pan used for burgers cut-side down and toast until light golden, 1-2 minutes.