I made this ricotta three different ways: with all milk, as the Salvatore recipe suggested (we found it a bit dry), with 3 cups milk and 1 cup heavy cream and with 3 1/2 cups milk and 1/2 cup heavy cream. Guess what? The last two ricottas were virtually indistinguishable.The extra cream did indeed add an even richer edge, but the one with less cream was also very indulgent. I imagine I’d use the richer version for toasts, for putting out at a party and the almost-as-rich one for pastas and things where I might need a larger, sturdier quantity. I’ll leave it up to you which way you go.