Pour the milk, buttermilk, cream, lemon juice and salt into a heavy-bottomed stainless-steel saucepan. Bring to a boil. DO NOT STIR! Turn off the heat and cover with an apron or dish towel. Set aside for 15 to 20 minutes. You will see the mixture separating into curds.
Line a colander with some cheesecloth and set in the sink or over another pot. Carefully scoop out the curds and set into colander and cheesecloth. Let ricotta drain for a few minutes and serve warm. You can set the ricotta into the fridge for use later. Fresh ricotta will keep refrigerated for up to 3 days, but you will eat it all way before then. Enjoy!