In 5 quart or larger pot heat all ingredients except vanilla extract to boiling over high heat, stirring often. Reduce heat to low, simmer uncovered for 5 minutes, stirring frequently. Remove from heat, stir in vanilla. Ladle into hot jars and cap after wiping tops of jars carefully. Process in boiling water bath 10 minutes. Sauce will appear thin while hot. Great flavor – reminiscent of old fashioned cream caramels.