My boys and husband love this. Add some corn chips or Cheddar cheese and it is to die for. I have made this for my husband's work and for church functions and it is always a winner.
I usually use a combination of beans like kidney and black or kidney and garbanzo. I usually use dried beans and cook them in my pressure cooker.
If you can't find puree, just use tomato paste and add water to it to get a puree consistency.