The original recipe is this one from simplyrecipes.com and is easy as pie and super delicious. Here it is as I cooked it;
Roasted Brussels Sprouts
1 pound Brussels sprouts
3 cloves garlic, minced
1 teaspoon blood orange juice
2 tablespoons olive oil
salt and pepper
1/4 cup freshly grated Parmigiano Reggiano
Preheat oven to 350°F. Place sprouts in a cast iron pan. Add garlic, orange juice and oil and toss to coat. Season generously with salt and a few grinds of pepper.
Put pan in oven on top rack for 20 minutes and stir to coat with the hot oil. Return the pan to the oven and cook for another 10 minutes. Sprinkle with Parmesan and cook for another 5 minutes. The Parmesan can be left out if you like.
Add more salt to taste if necessary and eat as if ravenous.