Open Greek-style salad sandwiches

Instructions

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1. 1 Put the feta, yogurt and garlic in a mini food processor. Blend until thick and smooth, then season with a grinding of black pepper.
2. 2 Toss the tomatoes, cucumber, olives, red onion and mint in a large bowl with the lemon juice. Season to taste.
3. 3 Spread the whipped feta onto the sourdough slices and pile each with the salad. Garnish with the remaining mint leaves and serve.