Preheat the oven to 200°C (400°F) Gas Mark 6. Cook the lentils according to the pack instruction, then drain and refresh under cold water.
Cut each chicken breast in half, but not completely through, so you can open it out flat. Place 2-3 slices of mozzarella onto one half of the chicken and then fold it back together. Wrap 2 slices of Parma ham around each chicken breast.
Heat 1 tbsp olive oil in a frying pan and sear the chicken breasts for 3-4 minutes on each side. Place in the oven to cook for 8-10 minutes. Meanwhile, mix together the lentils, spring onions, tomatoes and tarragon, and toss with the remaining olive oil and lemon juice. Cut into a thick portion of chicken and check that it is cooked through, with no pink showing. Serve the chicken breast on a bed of lentils.
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