Prepare the Onion: Soak the thinly sliced onion in hot water for about 10 minutes to soften its flavor. After soaking, drain and set it aside.
Slice and Grate the Vegetables: While the onion soaks, slice the cucumber, grate the carrot, and chop the apple into small pieces. Place these ingredients in a large salad bowl.
Prepare the Dressing: In a separate bowl, mix the lemon juice, crushed garlic, honey, and a pinch of salt. Stir well to combine.
Assemble the Salad: Add the soaked onion to the salad bowl with the cucumber, grated carrot, and chopped apple. Pour the prepared dressing over the ingredients and toss everything together to coat evenly.
Serve: Serve immediately, or chill in the refrigerator for 15-20 minutes for a more intense flavor.