Be sure to choose smaller eggplants; they'll be easier to slice and easier to handle on the grill.
Cut eggplants lengthwise into 1/2-inch-thick slices.
Combine mayonnaise, vinegar, lemon juice, pepper, sugar, and grated garlic clove in a bowl.
Heat a grill pan over medium-high heat; coat with cooking spray. Grill eggplant 3 minutes on each side. Top with dressing, capers, and salt.
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