Mix the base: In a bowl or large jar, whisk almond milk (and cream, if using), lemon juice, lemon zest, sweetener, vanilla, and a pinch of salt until the sweetener dissolves.
Add chia seeds: Sprinkle chia seeds evenly over the liquid.
Whisk briskly for 30–45 seconds so the seeds don’t clump.
Rest and re-whisk: Let the mixture sit for 5 minutes, then whisk again to break up any settling seeds.
Chill: Cover and refrigerate for at least 2–3 hours, or overnight for a thicker set.
Adjust texture: If it’s too thick, stir in a splash of almond milk. If too thin, add 1 teaspoon more chia, stir, and chill 30 minutes more.
Serve: Spoon into bowls or jars. Top with a touch more lemon zest or a few berries if you like.
Taste and tweak sweetness before serving.