Thinly slice the zucchini into 1/8-inch rounds—I like to use a mandoline for this to ensure even, paper-thin slices that will absorb the dressing beautifully. Halve the radishes lengthwise, then slice them into thin half-moons. Finely dice the red bell pepper and thinly slice the red onion. Chop the fresh parsley. Arrange all prepped vegetables in a large bowl.
In a small bowl or measuring cup, whisk together the extra virgin olive oil, freshly squeezed lime juice, honey, and crushed red pepper flakes. The honey will help emulsify the dressing and add a subtle sweetness that balances the acidity of the lime. Whisk until the dressing is well combined and the honey dissolves.
Pour the dressing from Step 2 over the vegetables in the bowl and toss gently to coat everything evenly. Sprinkle the kosher salt and freshly ground black pepper over the salad, then toss again until all vegetables are well seasoned. I like to let the salad sit for 5-10 minutes before serving so the zucchini and radishes can soften slightly and absorb the bright flavors of the lime and spices.