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1
Place the bread in the bowl of a food processor and pulse into fine breadcrumbs. Pour the breadcrumbs into a large bowl and add the ground beef, chopped red onion, thyme, mint, parsley, oregano, salt, salt, egg, and black pepper. Mix together with your hands until evenly combined. Break of quarter-sized piece and fry in skillet until cooked (or microwave on high power for 30 seconds). Taste for seasoning and adjust with more salt and pepper as necessary.
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2
Cut off 4 slices of feta 1/2-in wide each. Break off 1/4 of the meat mixture and work into an oval patty. Using your thumb, create a depression running longways through the middle of the patty and place 1 slice of the feta inside it. Form the meat around the cheese and seal, making sure to enclose the entire piece of feta inside of the meat. Repeat 3 more times with the remaining meat and cheese slices.
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3
When all the charcoal is lit and covered with gray ash, pour out and spread the coals evenly over entire surface of coal grate. Set cooking grate in place, cover grill and allow to preheat for 5 minutes.
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4
and
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5
the grilling grate. Grill the meat patties over high heat until browned on all side and just cooked through (center should read 135 to 145 on instant-read thermometer). Remove from the grill and let rest for 5 minutes. Transfer to a platter and serve with onion slices, tomatoes, and tzatziki.
