great way to introduce greens into children’s diets. The basic triad is a liquid, ripe fruit, and fresh greens. I’d start with a two-to-one ratio of fruits to greens to start with before tipping heavier toward greens on the scale. So, for example, one cup of water, a frozen banana, a cup of frozen berries, and a cup of packed baby spinach would be a classic green smoothie 101.