FOR THE SALAD
12 ounces romaine hearts, leaves separated
1/2 cup pitted Kalamata olives (about 2 1/2 ounces), drained
1/2 cup peperoncini, drained
1/3 cup caper berries, drained
2 medium tomatoes, cut into 1-inch wedges
2 Kirby cucumbers, halved lengthwise and cut into 1-inch pieces
1 medium red onion, halved lengthwise and crosswise, then thinly sliced
4 ounces feta cheese, crumbled