Make Chilled Cucumber Tomato Salad: toss cucumbers, tomatoes, herbs, and feta in a bright, herbaceous dressing for a refreshing, make-ahead side.
Whisk together the olive oil, red wine vinegar, sugar, salt, ground black pepper, and chili flakes until the sugar and salt dissolve and the mixture looks glossy and slightly thickened. Stir in the chopped basil and parsley last so the herbs fold into the dressing and release their aroma; the dressing should taste noticeably savory and a touch salty so it will season the vegetables when combined.
Place the halved cherry/grape tomatoes, sliced cucumbers, and thinly sliced red onion in a large mixing bowl. Pour the dressing over the vegetables and toss gently but thoroughly until every tomato half and cucumber slice is lightly coated — you want a shiny, slightly saucy surface without drowning the pieces. Scatter crumbled feta and a few extra torn basil leaves on top, then give a final light toss to distribute.

Transfer the tossed salad to the refrigerator and chill for at least an hour; cooling deepens the herb fragrance and lets the dressing season the vegetables so the tomatoes and cucumbers soften slightly while retaining a refreshing bite. Before serving, remove the salad and toss once more to redistribute any settled dressing and herbs.
Spoon the chilled salad into a large shallow serving bowl, arranging a few whole halved tomatoes and herb sprigs on top for a fresh look. Finish with a light drizzle of olive oil, a final crack of black pepper, and a few extra flakes of chili if you like heat. Serve immediately while the salad is bright, cool, and texturally crisp.
