Using a sharp knife or mandolin, very carefully and very thinly slice the fennel bulb, reserving the fronds to one side, cucumber and radishes. Add to a serving platter or bowl and toss to combine.
Step 2
Scatter over the fresh mint and a teaspoon of the fennel fronds. Season with salt and pepper and toss to combine.
Step 3
Drizzle with the lemon juice and olive oil and set aside for 10 minutes to infuse before serving.