Pack jalapenos and garlic into three hot 1-pint jars to within 1/2 in. of the top. In a large saucepan, bring sugar, vinegar, seasonings and, if desired, cayenne pepper to a boil. Reduce heat; simmer, uncovered, 5 minutes., Carefully ladle hot liquid over pepper mixture, leaving 1/2-in. headspace. Remove air bubbles and adjust headspace, if necessary, by adding hot mixture. Wipe rims. Center lids on jars; screw on bands until fingertip tight., Place jars into canner with simmering water, ensuring that they are completely covered with water. Bring to a boil; process for 15 minutes. Remove jars and cool.