I make this recipe about 6 times a year, or more. It's OUTSTANDING!!. I use all the ingredients listed except I increase some items: I use 3 cans of minced clams, 2 cans diced tomatoes and 1 - 14.5 can chicken broth.
To translate quantities as I use them:
1 cup onion = one large onion
1 cup chopped celery = 4 stalks celery
1/2 green pepper = 1/2 small green pepper
1/2 red pepper = 1/2 small red pepper
2 Tbls shallot = 2 or 3 large shallots
1/4 cup carrots = 2 carrots
2 cups finely chopped potatoes = 2 large Idaho potatoes
TIP: smoked tabasco tastes good added to the bowl, not the recipe.