The easiest way to remove seeds from mulberries involves using water and a bit of agitation to separate the seeds from the pulp. Here's a breakdown of the process:
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Pulverize the Mulberries: Place the mulberries in a bucket of water. You can use a paint mixer attached to a drill to thoroughly obliterate the fruit and separate the seeds. Alternatives to a paint mixer include using your hands (though messier), a blender (in batches and with plenty of water), or a food processor (also in batches).
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Separate Seeds from Pulp: After pulverizing the mulberries, add more water to the bucket. This helps to further separate the seeds from the pulp. The mulberry pulp will float while the seeds will sink to the bottom.
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Pour Off Excess Water: Carefully pour off the excess water and pulp from the bucket, being careful not to lose the seeds that have settled at the bottom. You might need to do this several times, adding more water each time to rinse away the remaining pulp.
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Collect and Dry the Seeds: Once you've removed as much of the pulp as possible, carefully collect the seeds. Spread them out on a paper towel or screen in a single layer and allow them to dry completely in a well-ventilated area. This drying process prevents mold growth.
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Store the Seeds: Once completely dry, store the seeds in an airtight container in a cool, dry, and dark place until you are ready to use them.