We've been enjoying these smoothies just about every day, changing up the ingredients to use what we have on hand. There's always an apple, cored and seeded, skin left on, and most always a pear, prepared the same as the apple. Variations include pineapple, bananas, blueberries, and frozen strawberries. And greens. LOTS of greens. About 4 cups! I started with kale, and have moved to spinach. Parsley is good thrown in there, too. We always add freshly ground flax seed, and some liquid. Some folks like to mix their fruit/greens with milk. You can use water and add a bit of honey or maple syrup to sweeten it, but we all love orange juice.
I puree everything in my Cuisinart blender, and serve. Four of us can have a pint from my one blender full.
Adding strawberries makes a more murky looking smoothie, but they taste great!