Start by trimming the fennel bulb and removing the tough outer layer. Slice it very thinly using a mandoline or sharp knife. Soak it briefly in ice water if you want extra crunch.
Peel and julienne or grate the carrots depending on your preference. Freshly cut carrots give the best crunch and natural sweetness. Keep them aside while preparing the dressing.
In a small bowl, whisk together lemon juice, honey, Dijon mustard, and olive oil. Add a pinch of salt, pepper, and optional garlic for extra flavor. Whisk until the mixture becomes smooth and slightly thickened.
Add fennel and carrots into a large mixing bowl. Pour the dressing over the vegetables evenly. Toss gently until everything is well coated.
Let the salad sit for 5–10 minutes so flavors blend beautifully. Taste and adjust seasoning if needed. Serve fresh for the best crunch and flavor