Then put them through a food mill to remove seeds and chunks, and return the pulp to the kettle
I'm not sure what a food mill is. Is it like the strainer featured in the link at post #4?
You can press them through a mesh sieve, or find yourself a Foley Food Mill; relatively cheap at thrift stores or discount stores. Don’t pay $40 for it!
http://www.thekitchenstore.com/072075500242.html