Benny, I am about to bottle a persimmon wine. If you can send me pic of your wife and you, I will put them on the label and send it off. Are you going to Aug 12 CRFG meeting? I am going to speak about growing bananas in the Bay Area. It will be a 1.5 hour talk. Yes, Port is a sweet and strong wine. The Spaniards in Port were the first one to popularize the technique. One way to achieve port wine is to let the fermentation of high sugar content juice go on for just 3 to 7 days, then fortify it with brandy or other distilled spirits to raise the alcohol to 20% and over. This stops fermentation, trapping the unique flavor at the particular midway fermentation. Then these are aged. One thing nice about Port wines is that they are very stable when stored for a long time, they never oxidize nor turn to vinegar if stored properly for ages, but the better they get. I have a different technique of making port wine, I don't fortify them because I can't justify spending plenty of money on brandy or distilled wine when if you distill them yourself (which is illegal) costs only $1 to a gallon (it is the taxes that makes them average out at $12 for a quart). Anyway, I use yeasts with high tolerance for alcohol, and sometimes I can reach abv of 23%, all without wine fortification.
Prickly pear, makes good port wine. They almost ferment to dryness, and if you add more sugar when fermentation subsides, they get restarted and the abv can increase to about 20% before the yeasts gives out.