Start with a jar or bowl. Choose a container with a lid, like a mason jar, for easy shaking and storage.
Combine the base. Add milk, yogurt (if using), sweetener, vanilla, lemon juice, lemon zest, and a pinch of salt. Stir or whisk until smooth.
Add chia seeds. Sprinkle in the chia seeds while stirring to prevent clumps. Mix well so every seed is coated.
Let it thicken in stages. Rest the mixture for 10 minutes, then stir again to break up any settling.
This step helps create a uniform, creamy texture.
Chill. Cover and refrigerate for at least 2 hours, ideally overnight. It should thicken to a pudding-like consistency.
Adjust texture. If it’s too thick, stir in a splash of milk. If it’s too thin, add 1 teaspoon more chia, stir, and chill another 20–30 minutes.
Add toppings. Before serving, top with berries, nuts, coconut, or a small swirl of lemon curd for extra zing.