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At least 1 hour before serving, combine the chia seeds, cocoa powder, and salt in a large bowl. Whisk to combine. Add your milk of choice, maple syrup, and vanilla and continue whisking until all cocoa powder clumps are dissolved and the chia begins to thicken. Cover with plastic wrap and place in the fridge for at least 1 hour, or as long as overnight.
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Transfer the thickened chocolate chia pudding to a blender and blend on high until very creamy and smooth. In a double boiler over boiling water, melt the chocolate chips until the chocolate is completely smooth.
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Add the melted chocolate, orange zest, and cardamom to the blender with the blended chia pudding, and blend on low until all is incorporated. Taste and add a touch more sweetness or salt if you like. Scoop the mousse out of the blender into a bowl. Refrigerate for 2 to 3 hours, to set.