Tzatsziki Hamburger's

For Tzatziki:

Finely chop 3/4 of the cucumber; place in a strainer and squeeze out any liquid. Place on paper towels and let sit for 15 minutes. Chop remaining 1/4 cucumber and set aside.

In a large bowl, combine yogurt, sour cream, garlic, herbs, vinegar, lemon juice and olive oil; mix well. Fold in finely chopped cucumbers. Cover with plastic wrap and refrigerate for at least 3 hours.

Prior to serving, garnish with salt, peppercorns and remaining chopped cucumber.

For Hamburger:

Preheat an outdoor grill for medium heat.

With clean hands, knead together the ground beef, Worcestershire sauce, parsley, salt, pepper and crumbled feta cheese in a bowl. Form the mixture into 4 equal-sized thin patties.

Cook on the preheated grill until the burgers are cooked to your desired degree of doneness, 7 to 8 minutes per side for well done. An instant-read thermometer inserted into the center should read 160 degrees F (70 degrees C).

To Assemble: