In a small bowl, combine the juice of two limes with thinly sliced red onion, granulated sugar, and kosher salt. Toss the mixture well so that the onions are evenly coated in the dressing. Let the onions pickle at room temperature for at least 15 minutes.

In a separate bowl, whisk together the remaining lime juice, minced garlic, finely chopped cilantro, olive oil, and a touch of granulated sugar and salt.

In a large salad bowl, layer the fresh butter lettuce as your base. Add sliced cucumbers next, then scatter halved cherry tomatoes and sliced peaches on top. Finally, crumble feta cheese over the salad.

Add a sprinkle of pumpkin seeds and the pickled onions to the salad. Drizzle half of the prepared dressing over the top, then toss gently until all ingredients are coated.