Strictly speaking, for a wine to be considered champagne, it must be produced in the Champagne region of France with grapes sourced locally. But if you do want to make your own version, this is the basic recipe.
Maturing time456 d 6 hrs 1 min
Although this recipe specifies 4-5 wines for blending, many wine houses use as many as 70 base wines for the assemblage. This requires skill and a nose for the right wine since the blend determines the 'character' of the finished champagne.