Fold your crepes in half twice, so they are in the shape of a triangle. In a non-stick pan over medium heat, melt half of the butter. When it begins to foam remove from heat and add 2 ounces of the liquor and 2 tablespoons of the sugar. Always add alcohol off of the heat to avoid a jumping flame. Use tongs to gently lay crepes into the pan. Turn the crepes to coat. Lay the crepes out on a plate and top with ice cream. Pour remaining sauce over the ice cream. Serve immediately.