Slice onions julienne and place in a large bowl.
Add 1 Tablespoon salt.
Add 1 teaspoon white pepper.
Place onion in a food saver heat seal bag that is durable enough to withstand heat.
Add 1 cup brown butter to the bag.
Shake the bag to mix the butter, salt & white pepper until all onions are evenly covered.
Using a Vacuum Sealer, vacuum the air out of the bag and heat seal tightly.
Once onions are in the bag and sealed they should look like the picture above.
Place onions in Alto-Shaam Cook & Hold Oven for 2 days at 200 degrees.
Onions after 1 day in the Cook & Hold Oven.
After 2 days in the Cook & Hold Oven.
Remove onions from the bag, plate and serve immediately. These onions are great for a soup, to eat with meat or chicken or to eat on their own. Enjoy!