It's not clear to me. > (pan-roasted oysters with a tomato sauce) over rice I picture a bowl of rice, then oysters on top of the rice, and then tomato sauc

It's not clear to me. > (pan-roasted oysters with a tomato sauce) over rice I picture a bowl of rice, then oysters on top of the rice, and then tomato sauce poured on top of the oysters. > (pan-roasted oysters) with (a tomato sauce over rice) I picture a plate. On one half is oysters, the other half is rice with tomato sauce poured on it. As someone who would never put tomato sauce on either oysters or rice, either are equally likely.