Wash the rocket and lamb's lettuce thoroughly and remove any roots.
Blend the greens with the cold water first, then add the apple.
Blend for about 60 seconds until smooth and pour into a tall glass.
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Taste
Fresh and green, with apple sweetness up front and a gentle peppery rocket finish.
About this smoothie
Leafy greens are the classic way to add vegetables to a smoothie, and they work best with sweet fruit. Here a red apple provides the sweetness, rocket adds a mustardy, peppery edge and lamb's lettuce contributes a soft, nutty taste. Leafy greens like these contain folate and vitamin K.
The smoothie is light and fresh, a good start to the day or a break in the afternoon. If you are new to green smoothies, start with less rocket and more lamb's lettuce, then adjust to your taste.
Bartender tips
Blending the leaves with the water first gives a smoother result without fibrous bits.
A little lemon juice balances the pepperiness and keeps the colour fresh.
Variations
Milder green
Replace the rocket with baby spinach for a softer, more neutral green smoothie.
Frequently asked questions
Is rocket too bitter for a smoothie?
Rocket is peppery rather than bitter, and the apple balances it. Start with 10 g if you are unsure.
Is this smoothie vegan?
Yes, it contains only fruit, leafy greens and water.
Can I use a green apple?
Yes, but the smoothie becomes tarter; a red apple makes it rounder.