Becky says, "Lettuce has an even lighter flavor than spinach in a smoothie, so don’t be shy about adding a healthy handful. Most lettuce is pretty watery, so your lettuce smoothies will be a little thinner than the green smoothies you’re used to."
Reprinted with permission from 40 Days of Green Smoothies, © Becky Striepe. Notes from Veggie Inspired: I used part romaine and part green leaf lettuce for this smoothie that I had already chopped for a salad the night before. I like to grind my chia seeds in a coffee grinder before adding them to the smoothie to ensure there are no full seeds left. You can eat the seeds whole, I just simply prefer them ground.