Blend the mango: Peel and dice 1 large ripe mango.
Add to a blender with 1–2 teaspoons lime juice and a pinch of lime zest. Blend until smooth. Set aside.
If using frozen mango, thaw first so it blends easily.
Mix the base: In a medium bowl or jar, whisk 1 cup coconut milk with 1 cup almond milk. Add 3 tablespoons maple syrup (or to taste), 1 teaspoon vanilla, and a pinch of salt. Whisk until combined.
Add the chia: Whisk in 6 tablespoons chia seeds.
Keep whisking for 30–45 seconds so no clumps form. Let it sit for 5 minutes, then whisk again to break up any seeds that settled.
Chill and thicken: Cover and refrigerate for at least 2 hours, preferably 4–6 hours, or overnight. The mixture should become thick and spoonable.
If it seems too thin, stir in 1–2 more teaspoons chia and chill another 30 minutes. If too thick, loosen with a splash of milk.
Layer with mango: Spoon a layer of chia pudding into glasses or jars, add a layer of mango puree, then repeat. Aim for even layers and reserve some puree for the top.
Finish and top: Add a small squeeze of lime over the top layer for extra brightness.
Garnish with toasted coconut flakes, chopped pistachios, or fresh berries.
Serve or store: Enjoy immediately, or cover and refrigerate for up to 4 days. The flavors continue to meld and improve by day two.