Sorry, I thought you were talking about the other mixed wine there. As for the sparkling wine being sweet, that is near impossible without carbonating them and then reopening them while almost frozen and adding a sweetener that has the sorbate and meta in it.
Here is an article about procedures for doing so.
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This method is a bit
more troublesome, but yields a sweet, sparkling wine without sediment.</span>
Make a basic dry table
wine, 10 - 11.5% alcohol by volume, finished, clear and stable.</span>
Take two ounces of
sugar for each gallon of wine and make it into a syrup with a little water.
Thoroughly mix the wine and syrup. (DO NOT try adding more sugar to get more
sparkle!).</span>
Be sure of a good
second fermentation, add one packet of Champagne Yeast or good all-purpose wine
yeast to the mixture and 1/4 teaspoon per gallon (NO MORE) of yeast energizer.</span>
Siphon the sweetened
wine into <st1
lace w
t="on">Champagne</st1
lace> bottles and cap with crown
caps. Store at 65º to 70ºF. Once a month pick up each bottle, turn upside down
and then put back upright. After three months all the sugar should be converted
to Carbon Dioxide and alcohol. Yeast deposited on the bottom will show you that
the sparkle is there. When you think the wine is ready, taste one bottle. Cool
it in the refrigerator, open it and see if the wine really sparkles. If so,
proceed as follows, ( by the way, this test is a delightful excuse for sampling
your wine early).</span>
Next, place your
bottles in a freezer and chill the wine to about 25ºF. This usually takes two
to three hours. You may see a little ice within the bottles when they are
ready. Now get an equal number of champagne bottles. Put into each of these
bottles one ounce standard sugar syrup and one tablet of wine stabilizer
(Crushed and dissolved potassium sorbate), and put these bottles into the
freezer along with the wine. The stabilizer is essential to inhibit the yeast
and prevent a third fermentation and possible explosions.</span>
When the wine is cold
enough, bring out one bottle of wine and one champagne bottle. Uncap the wine
and siphon it gently into the cold <st1
lace w
t="on">Champagne</st1
lace>
bottle, taking care to leave the sediment behind. Since the wine is cold, it
will loose very little gas. Now insert the plastic stopper and wire it down.
Then invert the bottle several times to mix the syrup and wine.</span>
This wine will be very
palatable almost immediately after bottling. Note, that one ounce of syrup
gives brut (Slightly Sweet) wine. If you want a Sweet wine, use two ounces of
syrup per bottle, plus the wine stabilizer tablet.</span>
*
Sugar Syrup 2 cups of sugar per one quart water yields five cups of syrup</span>