I’ve had a few green smoothie disasters in my time. I cannot make broccoli or courgette into any kind of smoothie that is vaguely drinkable. Hence, I tend to eat lots of these vegetables or use them for juices or in soups. My go-to greens for smoothies are cucumber, spinach, kale (but you have to remove the stalks and use the leaves only) and avocado. My secret ingredient is fresh mint. I keep a stash of it in the freezer just for adding to smoothies. I also keep chopped up frozen bananas to add sweetness and creaminess.