Instructions
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Optional: Preheat oven to 350°F. Spread out the raw almonds on a baking sheet and toast until lightly golden and fragrant, 8–10 minutes. Let cool.
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Using spice/coffee grinder, coarsely grind rice and if making a Matcha Horchata, cinnamon stick, and transfer to a large bowl. Add cooled almonds, cashews and 4 ¼ cups of water to cover. Cover and let soak in the refrigerator overnight.
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The next day, transfer the entire mixture with soaking liquid to a blender and add coconut milk, water, salt and Superblend. Blend on high until very very smooth.
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Strain mixture through a nut milk bag or fine-mesh sieve lined with a layer of cheesecloth into a large jar or a pitcher, pressing on the solids to extract as much liquid as possible. Discard the pulp. Sweeten to taste.
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Chill the Horchata until cold. The Horchata will naturally separate as it sits, so give it a shake. Pour over ice and serve.
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Do Ahead: Horchata can be made 3 days ahead. Cover and chill. Shake well before serving.