Medium pot with lid, aim for the heaviest/thickest pot you have
Quart-sized jar or bowl
Cheesecloth or thin dishcloth, coffee filters, paper towels etc. placed inside a mesh strainer
4cupswhole milk960 mL
¼cupplain store bought yogurtensure the container says “live” or “active” cultures, 60 g
Heat Milk: Place milk in a medium pot and heat to 185-200°F (85-93°C), stirring frequently to preventing a skin from forming.
Cool Bath: Transfer the pot with milk to an ice bath (I filled my sink with ice and water), to cool milk to 100-110°F (37-43°C).
Temper: Pour ½ cup of the warm milk into a separate clean jar or bowl. Mix in plain yogurt, stirring until yogurt is well blended. Add remaining milk and mix well.
Let Sit: Cover jar or bowl with a lid, wrap in a moist, warm towel to keep in heat, and place in oven. Turn on oven light to keep warm, and let the bacteria do its yogurt making magic for 4 to 8 hours (or overnight).*
Strain: You can eat the yogurt like this, or strain it to make Greek yogurt. To strain, line a mesh sieve with cheesecloth (or paper towels, coffee filters etc), and pour yogurt in. Place over a large bowl and let strain in the fridge for a few hours (or overnight), until it’s reach a consistency you like.
*The oven light should be sufficient for keeping the milk warm enough for fermentation. You can also turn the oven on for 1 minute (just enough to warm things up an insy bit) every so often. We’re aiming to keep the milk/yogurt at about 100 degrees F (37 C) throughout the whole process.