In a small bowl, combine marinade ingredients. Place chicken in a plastic bag and pour marinade over the top. Shake to coat and allow to marinate for at least 30 minutes, up to 2 hours.
Grill chicken on a pre-heated BBQ, on medium high heat, closing the lid to the BBQ, until all sides have nice grill marks, about 8 minutes each side.
1 cucumber (to make about ½ - ¾ cup grated cucumber after squeezing out juice)
1¼ cups plain yogurt
2 tsp white wine vinegar
1 tbsp lemon juice
1 tbsp extra virgin olive oil (or more if you want richer)
½ garlic clove, minced
2 tsp dill
½ tsp salt
Cut the cucumber in half lengthwise. Use a teaspoon to scrape the watery seeds out. Coarsely grate the cucumber using a box grater. Then wrap in paper towels or a tea towel and squeeze to remove excess liquid.
Place cucumber in a bowl. Add remaining ingredients then mix to combine. Set aside for at least 20 minutes for the flavors to meld.