Prep your ingredients. No need to peel the cucumber — just give it a rinse and chop it roughly. Grate or slice your ginger. Have your avocado halved and ready.
Add the liquid first. Pour the coconut water into your blender. Starting with liquid helps everything blend smoothly and protects your blender motor.
Layer in the soft ingredients. Add the avocado, cucumber, and ginger on top of the liquid.
Add the greens. Place the spinach on top — it blends best when it's not directly against the blades.
Add the frozen fruit. Drop in the frozen pineapple chunks last. The cold keeps the smoothie thick and chilled.
Add flaxseed and lemon. Spoon in the flaxseed and squeeze in the lemon juice.
Blend. Start on low, then increase to high. Blend for 45–60 seconds until completely smooth. If it's too thick, add a splash more water.
Taste and adjust. If you'd like it sweeter, add a small drizzle of raw honey or maple syrup and blend briefly.
Drink immediately. This smoothie is best fresh — the greens start to oxidise and the colour dulls if left sitting.