Place lamb chops on a large platter and pat dry with paper towel.
In a large re-sealable plastic bag or glass dish, combine lemon juice, olive oil, garlic, salt and pepper. Add chops to the bag and seal. Move bag around to make sure lamb chops are evenly coated with marinade. Marinate meat for 30 minutes or up to overnight.
When you’re ready to grill the lamb, let meat sit out at room temperature for 20-30 minutes and pre-heat grill to medium-high heat.
Grill 4-5 minutes per side or until meat thermometer reads 155 degrees. Remove from heat and let rest 10 minutes before serving.
While lamb is resting, make the Tzatziki Sauce by combining all ingredients in a medium bowl. Check for seasoning and adjust accordingly. Serve lamb chops with Tzatziki Sauce on the side.