Caramelized Onion Sourdough with Parmigiano-Reggiano and Italian Herbs

I have had a number of breads that include onions bookmarked, but never got around to trying them. So this is my attempt at this.
1. Caramelize 3 diced onions in 1 tbsp each of butter and olive oil. Since I quadruple my recipes, this took me 3 hours! Normally, it takes 45 minutes to an hour. Set aside to cool. I prepared mine a few days ahead and put them in the fridge. I let them come back to room temperature before using them.
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