Salads made with fresh, ripe tomatoes and crisp, cool cucumbers are popular in many Mediterranean cuisines. This version merges classic Greek horiatiki and the shopska salata of the Balkan countries. We salt the tomatoes and cucumber to enhance their flavor and draw out excess moisture and we soak slices of red onion and rings of fresh chili in vinegar to soften their bite. Good-quality cheese is key here. We find pre-crumbled feta to be lacking in flavor, so look for varieties sold in blocks and crumble it yourself.