Place yogurt and cucumber in a medium bowl.

Roughly chop garlic. Sprinkle salt on top of the garlic. Using the flat side of your knife, smash, scrape, and chop the garlic until it forms a paste. 

Add the garlic paste to the bowl along with the lemon juice, sugar, Worcestershire sauce, and pepper. Stir to combine, then taste for seasoning. It will likely need more salt, but taste it first and adjust accordingly.

Cover and refrigerate for at least an hour for best flavor.