Firstly the glaze from the Food Network:
Triple Citrus glaze
3/4 cup fresh orange juice
Pinch kosher salt and freshly cracked black pepper
I didn't have any marmalade so I subbed a tablespoon of mango chutney which worked well.
Basically I combined everything and boiled it down to about 1/2 cup. It was very good, sweet and piquant and the perfect compliment to the fish.
The Tuna is easy, a hot iron skillet, a bit of olive oil and a sear of 2-3 minutes on each side. The tuna was a nice medium rare.
I plated it all with a nice saute of zucchini and onions with a bit of Parmesan. Just hit the spot for a Wednesday evening.