Using a mandolin, finely slice the fennel and carrots. Finely slice and julienne the jicama into thin strips. Gently toss through lemon juice as you prepare it, to prevent it from going brown.
Sour Cream Dressing
Whisk all the dressing ingredients together.
Pour in half the dressing and toss through, place salad onto a serving plate. Drizzle over the remaining dressing.
Garnish with extra fennel fronds.
Recipe Notes
The sour cream and cream can be replaced with crème fraîche.