Place a fine mesh sieve over a large bowl, then set aside.
Pour the milk, cream and 1/2 tsp of kosher salt into a stainless steel or enamelled pot and bring to a full boil over medium heat, stirring frequently.
Remove from heat, stir in the vinegar and allow the mixture to sit for 5 minutes as it separates into curds (solids) and whey (liquid).
Pour the mixture into the fine mesh sieve and allow it to drain at room temperature for about 10 minutes, until most of the liquid has drained out, but the ricotta is still creamy. Transfer the ricotta to a bowl or container and discard the whey (or save for another use). Serve immediately, or cover and store in the fridge.