Place the yogurt in a medium bowl. Grate the cucumber on a box grater on the largest grating side and squeeze it with your hands to remove most (but not all) of the liquid. Add the grated cucumber to the yogurt. Add the sour cream, lemon juice, vinegar, dill, garlic, 2 teaspoons salt, and 1/2 teaspoon pepper and combine. Taste for seasonings.
To serve, artfully arrange salad plates with slices of feta, drizzle them with olive oil, and sprinkle with thyme leaves. Add the olives, pita triangles, and the tzatziki and serve cold or at room temperature.
Preheat the oven to 350 degrees.
Slice the pita bread into 8 triangles and place them on a sheet pan. Place the sheet pan in the oven and toast the bread for 10 minutes.
When taping the episode Ina substituted parsley for the thyme and added a sprinkle of freshly ground black pepper over the feta. She also added black olives and lemon wedges to the platter.
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