Punch on champagne (cold) (proportion for 15 people)
Two oranges juice, the juice of two lemons, a glass of rum, a glass of canned pineapple juice, 2 bottles of semi-dry champagne
Place a block of ice in the punch vase (the volume of the glass), pour in the juice of oranges and lemons, rum, pineapple juice (the order is important). Stir with a glass stirrer, then pour in the frozen champagne.