Place pork cubes in a large bowl with oil, oregano, thyme, sea salt, and pepper. Toss everything together to combine and leave to marinate for 20 minutes.
Soak your wooden skewers in water for at least 20 minutes, so they don't burn on the grill.
Grate the cucumber. Lightly squeeze the grated cucumber between your palms over the sink to remove excess moisture. Transfer the cucumber to a serving bowl and add yogurt, oil, minced garlic, dill, sea salt, and pepper, then stir. Refrigerate your tzatziki until ready to use.
Heat your outdoor grill or indoor grill pan to high.
Thread the marinated pork onto the wooden skewers.
Place on a grill or grill pan and grill 3-4 minutes on each side, or until cooked through and nicely golden brown.
Prepare your veggies. Chop your tomato, cucumber, onion, and parsley.
Grill the pita bread (if you like) until lightly browned on both sides, about 1 minute per side.
To serve, place tzatziki sauce on a plate, lay pork on top, add chopped veggies, and sprinkle with parsley leaves. Serve with the pita if desired.
Enjoy!