I read somewhere that you shouldn't store potatoes in the refrigerator because the cold turns the starch into sugar and makes the potatoes sweet. I don't know - I never keep potatoes in the fridge.
As for the onions, how about an onion pie? The recipe below used Vidalia's to take 5th place in a competition, but I think using red onions would be lovely. Adapt the cheeses and sauces to your taste.
Vidalia Onion Pie (by Captain Sauce, the World Famous BBQ Forum)
2 lbs thinly sliced Vidalia Onions
1- cup sour cream
1- cup Pepper Jack cheeze
1- cup sharp cheddar
6- tsp butter
4- pieces of smoked bacon fried and crumbled
2- splashes of Marie Sharps Blazen hot sauce (I use tabasco)
1/2 tsp salt
1- tsp white pepper
Saute onions in butter until clear. Let stand and cool some.
Grate cheese. Beat the eggs add the pepper jack, salt, pepper, sour cream and bacon to the eggs and mix well.
Pour into a 9 inch (unbaked)pie shell, add the cheddar cheese on top and bake at 375 for 40 minutes and let cool and serve.