Hey daisysunshine, do you have the Vegan Brunch cookbook? There are three sausage recipes in there, and I imagine you could use those as a starting point. Or there's this Simple Italian Sausage recipe on the ppk database, it doesn't have eggplant like the Field Roast but it does have fennel:
http://www.theppk.com/2012/01/vegan_sausage/ .