Authentic Spanish Sangria - cooking recipe

Ingredients

1 (750 ml) bottle red wine (cheap spanish tempranillo works great)
3/4 cup white rum
1/2 cup whiskey (sweeter the better)
1/4 cup triple sec
1/2 - 3/4 liter lime flavored seltzer water
1 cup sugar
1/2 lemon
1/2 orange

Preparation

Note: Because of the large volume I suggest making this in batches. This is one reason for the vagueness of the measurements.
Mix the wine with 3/4 cup sugar. Set rest of sugar to the side.
Add Liquors and stir.
Slowly add 1/2 ltr lime seltzer and stir.
Taste now and add any ingredients to taste. There SHOULD be a bit of a liquor bite to it, but it should NOT be overpowering. Likewise it should be sweet but not send you into a diabetic coma. It should also have a decent fizz to it, if it's too thick, add seltzer. Just experement.
Once you've got the taste you want, add the slices of fruit. I've found that the sangria i get in America tends to be loaded down with fruit. Remember that it's more of a garnish and only adds a bit of flavor. If you need a ton of fruit to get the desired flavor, you haven't got the right mixture.
Have fun experementing, and enjoy it. It's perfect for summer days and bbqs.
For another great (and much simpler) spanish drink check out my recipe for Tinto de Verano.
Chau.