In a 1-quart jar, combine the almond milk with the agave nectar. Close the jar and shake to combine. Add the chia seeds and lemon zest to the jar, then close and shake well. Refrigerate until very thick and pudding-like, at least 4 hours or overnight, shaking or stirring occasionally. Serve the pudding in bowls.
The pudding can be refrigerated for up to 3 days.
Citrus sections, diced mango, almonds and extra agave nectar.