Fill water tray to minimum fill line and add salt. Pierce sausage in several places with a fork or knife.
In the larger base of the steamer add sausage. Place lid on top and microwave on high for 6 minutes. Remove from microwave, add corn and potatoes. Replace lid, microwave on high for 12 minutes more, or until potatoes are tender and sausage is opague in the middle.
Meanwhile, make the honey butter. In a small bowl, stir together butter, garlic and honey until well combined. Add salt to taste.
Transfer corn, sausage and sweet potatoes to a large bowl. Toss with honey butter until butter has melted. Serve warm.