Brussel Sprout and Red Onion Pizza

I was wandering around the grocery store trying to decide what looked good for meals that week when I saw the fresh brussel sprouts basket and wondered how they would taste on a pizza. Some internet research paired brussel sprouts with red onions frequently so I decided to make the base of my pizzas a layer of marinated red onions slowly cooked down until they were super soft. Topped off with some dry mozzarella and brussel sprouts shaved super fine (so they cooked / charred consistently).