How can I use a lot of onions?

Online Answer
As an example, you could dice up one onion to keep in the fridge to add to salads, omelets, or beans throughout the week. You can take about four to five onions and caramelize them. Keep them in the fridge all week and add them to your meats, or pizzas, or casseroles. Make an Onion Soup out of them.
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Indigestion: People that experience indigestion often find that eating onion increases symptoms. Don't eat large amounts of onion if it increases your symptoms. Surgery: Onion might slow blood clotting and lower blood sugar..
Kept in the dark: Davison says your potatoes should be stored inside a paper bag in a cool, dark, dry place. And as mentioned above, away from onions and their sprout-encouraging gases.
There are many ways of using garlic.
Now, there's a new way to slice onions: spiralize them! ... By either using Blade A or Blade C, you can spiralize an onion and get different results. You can either "shred" the onion to get slices (that are perfect for sauteed onions) or you can get longer, curlier strands (that are perfect for frying or baking)..
Keep them in the dark: Potatoes and onions are best stored in the dark in a cool place (separately of course).