Cut the beans so that they fit in pint jars. Prepare the jars by rinsing them with hot water. Fill with the beans, stacking them lengthwise. To each jar, add 1 teaspoon dill seed, 1/2 teaspoon mustard seed, and 1 clove garlic cut in half. In a large pot, combine the vinegar, water, and salt. Heat to boiling. Pour the boiling solution over the beans, filling to within 1/2 inch of the top of the jar. Process in a boiling-water bath, tighten the lids if necessary, and cool. Store in a cool place for at least 2 weeks for the beans to develop their full flavor.