Thinly slice the bell peppers, radishes and scallion and dice the cucumber and avocado. Add to a large serving bowl with the watercress and cilantro and toss to combine.
Step 2
Quarter the eggs and add to the bowl and flake in the tuna. Stir to combine.
Step 3
Whisk together the lemon juice, olive oil, salt and pepper. Drizzle over the salad and stir to coat before serving.