Using a shredder, shred the cucumber. Transfer it into a strainer and strain all of its juices pressing it with a rubber spatula. Set aside.
In a mixing bowl, whisk together yogurt, lemon juice, garlic, salt and pepper.
Using a spatula, fold in the cucumber and dill. Transfer to a bowl.
If you have time, cover with plastic and let it sit in the fridge for a few hours before serving.
Video
Notes
Make Ahead: Make the recipe as written up to 3 days before serving. Place it in an airtight container and store it in the fridge. Be sure to give it a good stir before serving.
Storage: This sauce will stay fresh for about 3-4 days. Simply place leftovers in an airtight container and keep them in the fridge. If you notice any liquid separation, just give your Tzatziki a good stir before serving.