Here is a great recipe we have been using for Rhubarb Punch
2 1/2 cups chopped rhubarb
2 cups water
juice of 2 lemons
1 1/2 cups sugar
1 litre 7 up or Ginger Ale
Boil rhubarb, water and lemon juice until rhubarb is soft. Add sugar and boil again. Strain rhubarb pulp through a colander over a large bowl. Cool Rhubarb juice, just before serving add your pop, and maybe some fresh strawberries or raspberries to make it a pinky sangria. It's been a hit every time.
If you want a little different flavour substitute the lemon for 1 tbsp. of grated ginger, less sweet and yummy too. Don't overdo the ginger, can get a little nasty!