Tuna 'n' Pea Casserole Recipe

2 cans (10-3/4 ounces each ) condensed cream of mushroom soup, undiluted

1/2 cup mayonnaise

1/2 cup 2% milk

2 to 3 teaspoons prepared horseradish

1/2 teaspoon dill weed

1/8 teaspoon pepper

1 cup frozen peas, thawed

1 can (4 ounces) mushroom stems and pieces, drained

1 small onion, chopped

1 jar (2 ounces) diced pimientos, drained

2 cans (6 ounces each ) tuna, drained and flaked

1/4 cup dry bread crumbs

1 tablespoon butter, melted