Combine all ingredients into a blender and blend until smooth. If you want it thicker, add more ice or zucchini or both. If you want it thinner, add more milk. Taste test for sweetness. This brew isn't that sweet so another date or even tbsp of maple syrup might be necessary.
To paint the jar with chocolate, simply melt the chips in the microwave for 45 seconds, stir until all chips are melted and use the back of a spoon to paint the jar.