American

If making this in advance, wait to add the cucumber until just before serving.

Chihuahua, Cotija, and Mexican crema give the dish authentic flavor, but Monterey Jack, French feta, and sour cream are good substitutes.

This recipe calls for lime juice—rather than lemon juice or vinegar—to brighten the sweet flavor of summer tomatoes. We used heirloom varieties for their exceptional taste and vivid colors, but you can use any kind or size—from the farmers’ market or your own backyard—as long as they are ripe.

We used small potatoes for this recipe. If your potatoes are larger, adjust the cooking time.