Heat the milk:
Pour the milk into a large stainless steel pot and slowly heat it over medium heat to 85°F (29°C). Stir occasionally to ensure the milk doesn’t scorch.
Add the culture:
Sprinkle the mesophilic culture over the surface of the milk and let it rehydrate for 1-2 minutes. Then, stir gently to incorporate it into the milk. Allow the milk to sit at 85°F for about 1 hour for the culture to work.
Add the acid:
Add vinegar or lemon juice to the milk and stir gently. This will help the milk acidify, making it ready to form curds.
Add rennet:
Dilute the rennet in a small amount of non-chlorinated water (about ¼ cup) and stir it into the milk. Cover the pot and let it sit undisturbed for 1-2 hours, maintaining the milk temperature at 85°F. The milk should set and form a soft curd.
Cut the curds:
Once the milk has set and the curds have formed, use a long knife to cut the curd into ½-inch cubes. Let the curds rest for about 5 minutes before gently stirring them with a slotted spoon.
Cook the curds:
Slowly heat the curds to 105°F (40°C) over the course of 30-40 minutes, stirring gently every 5 minutes. This will help the curds firm up. Once they reach the target temperature, remove them from the heat.
Drain the curds:
Carefully ladle the curds into a colander lined with cheesecloth, allowing the whey to drain. Let the curds drain for 1-2 hours, or until the whey has mostly drained off.
Press the curds (optional):
If you prefer a firmer feta, you can place the curds into a cheese mold and press them gently to expel more whey. Press the cheese for 6-12 hours, flipping the cheese occasionally to ensure an even texture.
Salt the feta:
Once the cheese has drained and reached the desired consistency, sprinkle the salt evenly over the surface. For a more intense flavor, you can also add herbs like oregano, thyme, or rosemary at this stage.
Age the feta:
Store the feta in a container filled with brine (water and salt) or olive oil in the fridge for 2-3 days to allow the flavors to develop. Feta can also be kept in a simple saltwater brine for up to 1-2 weeks.
Serve:
Once the feta is aged to your liking, remove it from the brine or oil and serve as a topping for salads, roasted vegetables, or in Mediterranean-inspired dishes.