Take 1 medium-sized cucumber, wash it thoroughly, and peel the skin. Grate the cucumber and squeeze out the excess water using a clean cloth or paper towel. Set aside the grated cucumber.
In a mixing bowl, add 250 grams of thick Greek yogurt (dahi) and whisk it until smooth.
Add the grated cucumber to the yogurt.
Mince 2 cloves of garlic and add it to the yogurt-cucumber mixture.
Finely chop 2 tablespoons of fresh dill and add it to the mixture.
Add 1 tablespoon of extra virgin olive oil, 1 tablespoon of lemon juice, and salt to taste. Mix all the ingredients well.
Refrigerate the tzatziki sauce for at least 1 hour to allow the flavors to blend.
Before serving, give the sauce a quick stir and garnish with a drizzle of olive oil and a sprinkle of fresh dill.