Grate the cucumber using a box grater or food processor until finely shredded.

Drain the grated cucumber in a clean kitchen towel or fine mesh sieve for about 10 minutes.

Mix together the drained cucumber, Greek yogurt, minced garlic, olive oil, lemon juice, and chopped dill in a medium bowl. Stir gently until well combined.

Season with salt and pepper to taste.

Chill the tzatziki in the refrigerator for at least 30 minutes before serving.