add the butter and oil to a large pot on medium, add the onions, salt and pepper and stir to coat, cover and let the onions cook down until translucent ( stirring occasionally) about 15 mins.
Uncover and continue cooking and stirring till golden brown another 15 mins. ( careful not to burn)/
add in the flour and stir about a minute, then the apple cider vinegar as well as the Beef broth ( you can substitute vegetable broth for a vegetarian version)
add in the thyme and let simmer another 10 mins.
lightly toast a thick piece of french bread, in an oven proof bowl, pour soup almost to top, then place the bread and cover with 2 ( OK maybe 3) slices of mozzarella cheese.
Broil about 5 mins, until cheese is melted, bubbly and edges are perfectly brown....ENJOY the gooey deliciousness hearty soup.
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