Note from Ricardo We prefer using a silicone mat rather than parchment paper for this recipe to encourage the water from the fruit to evaporate more quickly. It is important to use a straight-sided, non-warped sheet pan to ensure even cooking. If the sheet pan is warped, parts of the fruit paste will be overcooked while other parts will be undercooked. If your oven does not go as low as 170°F (75°C), you can cook this recipe at 200°F (95°C) and reduce the cooking time to between 2 1/2 and 3 hours.