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Heat small saucepan over medium high heat. Add vinegar, sugar, mustard seed, salt and garlic to the pan, and cook until it begins to simmer and sugar dissolves. Toss the dill, bay leaf, jalapeno and sliced cucumbers together in a heat-proof bowl. Pour the simmering liquid over the cucumbers and stir to evenly coat. Allow to cool to room temperature or chill before serving.