"[Photograph: J. Kenji Lopez-Alt] About the author: J. Kenji Lopez-Alt is the Chief Creative Officer of Serious Eats where he likes to explore the science of home cooking in his weekly column The Food Lab. You can follow him at @thefoodlab on Twitter, or at The Food Lab on Facebook. Every recipe we publish is tested, tasted, and Serious Eats-approved by our staff. Never miss a recipe again by following @SeriousRecipes on Twitter!..."
INGREDIENTS
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1 small cucumber, seeded and cut into fine dice (about 1 1/2 cups)
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1 large ripe tomato, seeded and cut into fine dice (about 1 cup)
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Kosher salt
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1 tablespoon lemon juice
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Freshly ground black pepper
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1/2 cup Greek-style yogurt
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1/4 cup mayonnaise
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1/2 cup finely crumbled feta cheese
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1 medium clove garlic, minced (about 1 teaspoon)
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20 ounces freshly ground beef, divided into four 5-ounce patties
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Sliced white or sweet onion (such as Vidalia)
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4 toasted hamburger buns