Put all ingredients (except chia seeds) in blender and blend until smooth (about 1 minute)Â *Add additional sweetener to your liking, if desired.
Garnish with chia seeds and chopped rhubarb and a stalk of rhubarb, if desired.
Notes
Top tip:It's best to use ground fennel seeds. If you don't have ground, you can grind them with a mortar and pestle or in a coffee grinderStorage:Â Store this smoothie in an airtight container in the fridge for up to 24 hours. However, keep in mind that the longer it sits in the fridge, the more the banana flavor takes over and the banana will make it brown, as well.Can you leave smoothies in the fridge overnight?Yes, you can leave smoothies in the fridge overnight in an airtight container. However, if you have banana in your smoothie, you'll want to use it as soon as possible, as the banana will start to turn the smoothie a brown color and the banana flavor will become much stronger.