You can grind sesame seeds by toasting them first, then crushing them in a bag with a rolling pin or other heavy object. Here's a step-by-step guide:
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Toast the sesame seeds: Toasting enhances their flavor and makes them easier to grind. A saucepan is preferable to a frying pan, as it allows for more even heating.
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Cool the toasted seeds: Allow the toasted sesame seeds to cool completely before proceeding. This prevents clumping and helps them grind more effectively.
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Place seeds in a durable bag: Transfer the cooled, toasted sesame seeds into a tough plastic bag. Seal the bag tightly to prevent seeds from escaping.
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Grind the seeds: Using a rolling pin (or the back of a sturdy spoon), firmly press down on the seeds within the bag. Continue rolling and pressing until you achieve your desired texture. You can control the consistency, making it finely ground or leaving it coarser, depending on your preference.