Add the whole milk to a large pot. Place the pot over medium heat. Using a wooden spoon, gently stir the milk as it heats up to prevent it catching on the bottom of the pot. Do not leave milk unattended on the stove as it can burn on the pan or boil over.
Heat the milk slowly until it reaches 194°F, stirring regularly. This will take between 10 to 15 minutes. When the milk reaches 194°F, turn off the heat. Stir in the lemon juice and 1 teaspoon of the kosher salt. The milk should begin to curdle immediately. Let sit for 15 minutes.
Meanwhile, line a strainer with cheesecloth and place over a large bowl. After the curds have sat for 15 minutes, begin to spoon the mixture into the cheesecloth-lined strainer. Allow the whey to drain off the curds.
There will be a lot of whey. You can choose to save the whey to use in other recipes (**see note) or add it to your garden. Otherwise discard it. After all the curds have been poured into the strainer, allow them to drain until the cheese is fairly dry, about 1 hour.
After draining for an hour, transfer the fresh ricotta to a container and chill. It is now ready to be used. This amount of milk will make 2 cups of ricotta cheese.