In a medium mixing bowl, add all ingredients except for the dill and cucumber (so onion, garlic, coconut yogurt, salt, pepper, lemon juice, apple cider vinegar, mustard, and maple syrup). Mix the dressing until smooth. NOTE: For less intense onion/garlic flavor, you can soak the onion and garlic in boiling water for 5 minutes, then strain well and add to the mixing bowl.
Add the dill and sliced cucumber and mix again until cucumber is well coated with dressing.
Taste and adjust as needed, adding lemon juice or apple cider vinegar for acidity, maple syrup to balance the acidity, dill for herby flavor, or more cucumber for a less saucy dressing.
Best when fresh. If preparing in advance, store dressing and cucumber separately in the refrigerator for up to 2-3 days. Not freezer friendly.
*Thinly slicing the onion is more traditional, but we found it easier to eat when finely diced. *Adapted from The Blond Cook. *Nutrition information is a rough estimate.