Herb Butter Sauce

Why I Love This Recipe
This is a simple and very flavorful sauce for vegetables. This makes enough for about 2 lbs of vegetables. You can use any herb or mixture of herbs you like.
Ingredients You'll Need
2 Tbsp Butter
2-3 Tbsp, finely minced onion
1/2 Tbsp Mustard, any kind will do, but Dijon Mustard is especially nice
1/4 tsp dried Tarragon
Salt and pepper