
I start mine with scraped raw beef. I get a piece of steak and use the blade of a knife to scrape the flat surface to create a soft pulpy paste. This has absolutely no stringy bits for a pup to choke on.
For the first few days each pup (dalmatians, so a medium-sized breed) is given no more than a teaspoonful once a day, then a teaspoonful twice a day, fed from my fingers. I find that's plenty to get them started without risking overloading their stomachs.
Hope this helps.
:)