Zest and juice the lemon: Zest the lemon first, then cut and juice it. You’ll need about 1 teaspoon zest and 1–2 tablespoons juice.
Avoid the white pith—it’s bitter.
Mix the liquids: In a medium bowl, whisk 1 cup milk, 1/2 cup plain Greek yogurt, 1–2 tablespoons sweetener, 1 teaspoon vanilla, the lemon zest, and 1 tablespoon lemon juice. Taste and adjust sweetness or lemon as needed.
Add chia seeds: Whisk in 3 tablespoons chia seeds until evenly dispersed. Let it sit for 2–3 minutes, then whisk again to break up any clumps.
Chill: Cover and refrigerate for at least 2 hours, or overnight for the best texture.
The pudding should be thick and creamy.
Adjust thickness: If it’s too thick, stir in a splash of milk. If it’s too loose, add 1 more teaspoon chia seeds and chill 15–20 minutes.
Serve and top: Spoon into jars or bowls. Add berries, coconut, sliced almonds, or a sprinkle of extra zest.
Enjoy cold.