Tropical Fruit Smoothies

Line rimmed baking sheet with parchment paper; arrange banana and tropical fruit in single layer on baking sheet. Freeze fruit until very cold, but not frozen, about 10 minutes. In blender, puree cold fruit, milk, juice, salt, 1 tablespoon sugar, 1 teaspoon lemon juice, and ice until uniformly smooth, 10 to 15 seconds. Taste for sugar and lemon; if desired, add more sugar or lemon and blend until combined, about 2 seconds longer. Serve immediately.