Put all the ingredients except sugar and vodka in a saucepan and boil slowly for 20 minutes, stirring occasionally. Place a rack over the pan, and spread the sugar lumps out on it.
Warm the vodka in a small saucepan, and pour it over the sugar lumps, saturating them. Carefully ignite the sugar, and let it melt into the gloog mixture. Stir.
Strain into heated mugs or punch cups, and add a few of the cooked almonds and raisins to each cup. (Leftover gloog can be bottled and reheated.)