Place 1 slice of prosciutto on top of 1 chicken breast. Spread 1 Tablespoon of pesto over the top. Roll the breast, beginning with one small side. Secure with a toothpick that has been soaked in water to prevent burning. Continue until all of the chicken breasts have been prepared this way.
Place the chicken breasts in a casserole dish and drizzle them with 3 Tablespoons of the lemon juice. Cover and refrigerate overnight.
Preheat oven to 350 degrees.
Combine the olive oil, garlic, 1 Tablespoon lemon juice and pepper. Pour over the chicken. Cover with foil and bake for 20 to 30 minutes.