Pack carrots, dill and garlic into 1 clean 1-quart glass jar (I re-used a pickle jar from the store). In another jar, combine the salt, sugar, vinegar, and coriander. Shake until the salt and sugar dissolve. Add water and pour the brine over the vegetables. Add extra water if needed to keep the vegetables submerged. Close the jar and refrigerate overnight or for up to 1 month.