I too grew up in England but we ate rhubarb crumble, not pie. I am sure you can use the filling in a pie too.
10 stalks rhubarb cut into chucks
1 cup sugar
1/4 cup water or white wine
pinch of fresh ginger or powdered
cook in large saucepan until rhubarb is soft (20 mins or so)
Recipes vary but this is one I particularly enjoy
1 -2 cup squick cook oatmeal
1/4 -1/2 cup caster sugar
1/4 -1/2 cup melted butter
cinnamon to taste
Once rhubarb is cooked, put it in a baking dish, spread crumble mixture on top and bake for 25 mins.
Serve with custard, ice cream or cream.
Sometimes, I add strawberries or pineapple to cut the rhubarb.