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1 shallot, thinly sliced
1 leek, thinly sliced
2 scallions, thinly sliced
2 tbsp olive oil,
1 tbsp salt
1 garlic clove, grated
½ cup mayonnaise
½ cup sour cream
2 teaspoons fresh lemon juice
1 teaspoon chopped fresh thyme, plus more for serving
2 tablespoons buttermilk
Freshly ground black pepper
Step 1: Heat broiler. Toss shallot, leek, and scallions with olive oil; season with salt. Broil, tossing once, until charred, 10–15 minutes. Let cool. Mix with garlic, mayonnaise, sour cream, lemon juice, and thyme. Thin with buttermilk; season with salt and pepper. Serve topped with thyme.