This is more of a technique than a recipe and it is not purely a plant based method. It belongs in both worlds but is especially useful here.
Caramelizing onions in a slow cooker may take some time (24hrs) but its is all inactive time and this method also produces a tasty byproduct - caramelized onion water. It also makes yer house smell like an onion but in a good way.
6lbs sweet onions sliced 1/4" thick in my 7qt slow cooker. Just onions. Nothing else.
12hrs in. Cooker set to low
At 20 hrs in remove most of the onion water and raise the cooker's temp to high for another 4 hrs. How long you leave it at this stage depends on how deeply colored you want the finished onion. If your crock pot's high setting is hot enough, you also have the option of cracking the lid and letting the onion water reduce to a syrupy consistency.
Add your favorite additional ingredients at this point if you want French Onion soup or use them as is. You may also freeze portions for later uses. Or just spoon them into yer pie hole.
This batch gave me about 1.5 cups caramelized onion water which I froze in ice cube trays before vac packing them for freezer storage. These onion water cubes make for a wonderful addition to soups and stews.
No, this isn't coffee. Its caramelized onion water
No salt. No fat. No meat, eggs or dairy. Just awesome caramelized onions.