Rinse the cucumber, grate it on the thick side of the grater and place in a strainer. Squeeze with your hands to remove any excess liquids.
Peel the garlic cloves, put them in a food processor, add salt and mix to combine to a paste.
Put in a bowl the olive oil, vinegar, garlic/salt mixture and mix well to combine.
In another bowl we put the yogurt, the dill, the cucumber, drained and stir to combine. Add the garlic/vinegar mixture and continue stirring. Cover the bowl and keep "tzatziki" in the fridge for at least 1 hour.
Stir well before serving.