Step 1
In a small dry skillet, toast the peppercorns and coriander seeds over moderately high heat, shaking the pan frequently, until fragrant, about 1 minute. Transfer the toasted peppercorns and coriander seeds to a work surface and let cool. Using the back of a heavy knife, coarsely crack the peppercorns and coriander. Transfer to a large, sturdy resealable plastic bag. Add the minced garlic and 1/4 cup each of the soy sauce and granulated sugar, then add the steaks and seal the bag, carefully pressing out as much air as possible. Refrigerate for 2 hours.