Balsamic Butter Vegetables

This recipe was inspired by the bagged version of Balsamic Veggies from Trader Joe's.  My version didn't quite live up to the expectations that TJ's set, but I'll keep trying to perfect the flavor.  If anyone has any ideas (besides the obvious "just buy theirs") let me know!

traderjoes365.blogspot.com

1/2 bag of frozen mixed veggies (or you could use fresh ones)
1 tbsp. butter
splash balsamic vinegar
spices (I like Tuscan Kitchen's Pasta & Veggies)

1. Melt the butter in a frying pan.
2. Add the veggies
3. sprinkle in the spices
4. add the vinegar
5. cook over medium heat for about 5 minutes