Pour in a blender the olive oil and grated garlic and blend until combined.
Remove the skin and the seeds of the cucumber and grate it into a large bowl.
Season with salt and pepper and leave aside for 10 minutes.
Wrap the grated cucumber in a towel and squeeze, in order to get rid of the excess water.
In a bowl, add the cucumber, the blended garlic and oil, the yogurt, 1-2 Tablespoons of red wine vinegar, dill, a pinch of salt and blend, until the ingredients are combined.
Store the tzatziki sauce in the refrigerator until ready to use and always serve cold.