Usage patterns
〈物〉にスパイスを効かせるto give a dish a spicy kick
This curry has a good spicy kick to it.
スパイスを加えるto add spice (to a dish)
I added spice to the soup to bring out the flavor.
スパイスが効いているthe spice is noticeably strong/flavorful
This dish has a strong spice flavor that whets the appetite.