My mother spoiled us. She lovingly sauteed liver in onions each week and chopped it by hand. I must confess that I don't go to those lengths for our Shabbos liver (but I do enjoy it immensely when we visit my mother for Shabbos!). Here's how I doctor the ordinary store-bought stuff:
1 pound chopped beef liver
3 hard boiled eggs, chopped fine
1 teaspoon honey
1/2 teaspoon mustard, preferably dijon
dash of salt
dash of pepper
Combine all of the ingredients in a large bowl. Mix well and serve.