From Cook's Illustrated. You will need 2-3 medium oranges to yield the approximate amount of orange zest. Use peeler to remove zest, ensuring that some pith comes off with zest. Don't use low-sodium soy sauce for this recipe.
For the orange zest, you need 10, 3" strips of orange zest, thinly sliced lengthwise (1/4 c) plus 1/4 c juice