Place a medium-size fine mesh colander in the sink.

Heat 4 cups of water to boiling in the microwave on high power, about 5-6 minutes. Carefully add onions to the hot water. After 15 seconds, pour onions into the colander to drain.

Transfer onion and lemon slices to a jar (or several jars) that will contain the onions. You want the onions to fill the jar(s) to the brim, but don’t pack them in.

Combine vinegar, sugar, salt, in a medium size microwave-safe bowl. Stir, then cook on high for three minutes. Remove from microwave, add fresh lemon juice and stir to make sure all of the sugar and salt is dissolved.

Pour hot solution over the onions. Add enough water to bring liquid level to the top of the jar(s). Watch the beautiful color transformation begin to take place!! Color change will continue for the next 12 hours.

Cover the jar and allow to cool for 30 minutes then refrigerate for at least 2-3 hours before eating. This will allow flavors to meld. Onions will keep well in the refrigerator for 5-7 days.