Cook in microwave, from 3 to 6 mins., depending on size of bottle and power of Microwave. When water has boiled up inside jar, cooking he fruit, and a little has oozed out of under lid then it is ready. Remove from Microwave with a cloth and screw on lid tightly. Stand on bench to cool down. When cool wash in hot soapy water to remove any sticky liquid that has oozed out.