Ginger Pear Green Smoothie

large ripe pears, weighing about 1 pound

ripe bananas

stalks lacinato kale, (also known as black or Tuscan kale) weighing 4 ounces

small piece of ginger, about 1" x 1" weighing 1/2 ounce

bottle of kombucha, citrus flavor

Optional: 1/2 - 1 cup water to thin the smoothie after blending