Cut carrots into lengthwise slices that will fit a pint size jar.

Pack into two pint sized jars. In each jar, also place a piece of onion, a garlic clove, 1 tablespoon of salt, 1/2 tablespoon of dill weed, 1/2 tablespoon dill seed, and a pinch of cayenne pepper.

Bring vinegar and water to a boil.

Pour over carrots leaving a 1/2" headspace. Check for air bubbles. Process jars in a boiling water bath for 15 minutes.

Adjust time according to your altitude.