Combine the beef with half of the salt (optional), pepper, and crushed garlic. Add the scallions and capers and mix well.
Carefully fold in the crumbled feta, and shape the beef mixture into 8 even-sized patties; set aside.
To make the tzatzki, grate the cucumber into a colander and combine with the remaining salt (optional). Allow cucumber to drain in the colander for about 10 minutes. With a kitchen towel or cheese cloth, squeeze excess moisture from the cucumbers and place in a bowl. Add the yogurt and remaining pepper and garlic to the cucumbers, and stir to combine.
Broil the beef patties on high for about 5 minutes to an internal temperature of about 165*F, flipping once to achieve even cooking and browning.
Serve burgers on a large lettuce leaf with tzatzki.
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