I bought a bag of frozen tuna steaks, and wanted a way to cook them through without drying them out. We really liked this dish. I make ratatouille all the time, and this one was very good. I used a can of diced tomatoes instead of fresh. I had thawed and rinsed the tuna steaks, but they are so full of water. I read a tip somewhere else to dry them with paper towel (top and bottom) and it took me 3 sets of towels before they were pretty dry. However, it was worth the nuisance; they tasted better than any of my previous attempts with tuna. This rub is very good; the fennel and orange zest are a great combination.