Prep the rhubarb: Rinse and trim the rhubarb.
Slice into small pieces. Place in a small saucepan with a splash of water and simmer 5–7 minutes until just tender. Cool completely.
This step tames the tartness and blends the texture.
Chill your fruit: If you can, freeze the banana slices and use partially frozen strawberries. Colder fruit makes a thicker, creamier smoothie without extra ice.
Add to blender: Combine the cooled rhubarb, strawberries, banana, yogurt, 3/4 cup milk, vanilla, and 1 tablespoon honey or maple syrup.
Blend until smooth: Start low, then move to high. If it’s too thick, add a bit more milk.
If it’s too tart, add another teaspoon of sweetener.
Taste and tweak: For a flavor lift, add a pinch of cinnamon. For extra chill, toss in a few ice cubes and blend again.
Serve right away: Pour into glasses. For little kids, use smaller cups and straws to make it fun and easy to sip.