Cut the ends off the cucumber. Slice the cucumber in half lengthwise and remove the seeds. Grate remaining cucumber and toss with salt in bowl. Set salted grated cucumber in strainer over bowl or in sink and let stand for at least 15 minutes. Squeeze to remove as much liquid as you can and discard liquid. Ideally you want about 1 cup of grated cucumber for the Tzatziki.
Combine cucumber with remaining ingredients in large bowl. Mix to combine, taste, and add additional salt, lemon juice, or dill, if desired.
Too sour? Add more salt.Too salty? Add more lemon juice.Too bland? Add more garlic and/or dill.