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["Bring the milk to a boil.", "Let the milk cool to 35-40C.", "Place the 2 teaspoons of yogurt in a plastic container and add 2 tablespoons of warm milk.", "Stir with a spoon until it has blended completely in the milk, then add 2 more tablespoons and stir well again. The yogurt must be perfectly incorporated and blended, there must not be any lumps.", "Add the remaining milk and stir to incorporate well for at least one minute.", "Replace the lid on the container and place it in the oven.", "Place a white plate on the oven's dripping pan and on the plate place a light bulb.", "Close the oven door, since the light bulb's wire is thin it will not be a problem and turn on the light bulb. A 40W light bulb will provide just the right amount of heat to foster the reproduction of the lactobacillus and saturate the milk turning it into yogurt in 3 hours. After 3 hours, remove the lid from the container and ""knock"" on the side of the container with your knuckles to check if the milk surface is liquid or solid. If it's liquid, leave it in the oven for an additional 30 minutes before checking it again.", "If the milk surface is solid and thick, replace the lid and carefully bring the container to the refrigerator and leave it there overnight before using it the next day. (The yogurt develops from the bottom to the top, therefore the surface is the last part to thicken.)", "Don't forget to save a teaspoon of yogurt to be able to make it again, it gets better each time and you can repeat this process for years."]
