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["Pour hot tap water into a clean wide-mouth 1-qt. canning jar and set aside.", "Whisk together whole milk and dry milk in a medium saucepan. Heat over medium heat, whisking often, until milk reaches 195u00b0 on an instant-read thermometer. Adjust heat to keep milk at 195u00b0 and cook, whisking often, 10 minutes. After heating, ""you're going to have a thicker, more stable curd,"" Fletcher explains. Remove from heat.", "Set pan in a sink of ice and water and cool to 115u00b0. ""The milk cools fast, so keep checking it. If it goes too low, just reheat it."" (But don't let it go above 118u00b0, or it will kill the yogurt.)", "Put yogurt in a small bowl and whisk in about 1 cup hot milk to temper it and thin it out, then whisk this back into milk in pan. Transfer milk to a container with a spout. Drain hot water from jar and add hot milk mixture. Put lid on jar.", "Incubate yogurt. ""I wrap it in a kitchen towel so it doesn't get my blankets dirty, then set the jar in a blanket nest."" Fold a small blanket or beach towel in quarters, set on a counter, and fold sides up over yogurt. Snugly tuck 2 more folded blankets around the outside. Let yogurt sit undisturbed in a draft-free place 5 hours.", "Unwrap and tilt jar gently to check if yogurt is set. ""It should be like a baked custard."" If not, rewrap and check in another 1 to 2 hours (it may take up to 12 hours total). The longer it cultures, the tarter it will taste. You may also get liquid--the whey--forming around the curd. ""I like it mellow, so I try to stop it as soon as it's set.""