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To toast dill seeds: Heat small skillet on medium heat 2 minutes. Add dill seeds; cook 1 minute or until seeds are fragrant, shaking pan frequently. Immediately remove seeds from skillet to avoid over-toasting.
Make Ahead: Shrimp cakes can be made up to 24 hours ahead. Cool, wrap and store in the refrigerator. Reheat on baking sheet in preheated 350°F oven for 10 minutes. The aioli can be made up to 24 hours ahead. Refrigerate in covered container until ready to serve.