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Want to avoid all the thickeners and preservatives that some brands of evaporated milk use? Make it at home!
Evaporated milk, that slightly thick milk that typically comes in a can, is a fairly easy ingredient to make at home, considering it has only one ingredient: milk.
But despite its simplicity, it's also a bit cumbersome when done in the traditional way on the stovetop, which is how I've done it for years.
To make evaporated milk, you heat milk and evaporate away 60% of its volume. The final result is silky and sweet and it's what we use to make many creamy concoctions where whipping cream is too heavy and whole milk is too light, such as homemade condensed cream of mushroom soup.
Its cousin, sweetened condensed milk, which is used in many beloved holiday recipes, is exactly the same thing except you whisk in a bit of sugar as part of the condensing process.
While this sounds simple, the cumbersome aspect comes in the method. In order to keep the milk from scorching while it heats and to keep it evaporating efficiently, we have to keep it on very low heat and whisk it often. And honestly, I have yet to make a batch where I haven't scorched it, even when my burner is on its very lowest setting and I whisked every five minutes for hours on end.
But then I realized an easier way was to be had. 🙂
Slow cooker, to the rescue!
A slow cooker is an easy way to heat the milk evenly without scorching it – or at least minimizing the amount that sticks to the sides.
It's also a fairly hands-off method, so you can go about your day much more freely without having to remember to whisk the milk every few minutes. I still take off the skin that forms on the top every hour or so, just to keep it evaporating efficiently and to minimize the amount that sticks to the side, but other than that, you can just let it sit while you go about your day.
Oh, and please remember that slow cookers vary wildly in their temperatures and in their volume, so while I've listed what typically works for me, just keep an eye on yours and adjust as needed. I suggest giving yourself at least 24 hours for this project the first time you make it. You likely won't need anywhere near that amount of time, but better safe than sorry. 🙂
- 2 quarts (8 cups) of milk
- First, pour three cups of water into the empty slow cooker and use a ruler to measure the depth. Note this measurement, as this is the depth your milk will be when it is finished.
- Pour water out and place the milk in the slow cooker. Heat on high for 18-20 hours with the lid off, unless you notice scorching, then switch it to low. Remove the skin that forms on the top periodically, especially toward the end of cooking, but don't scrape up any milk that cooks onto the sides.
- When the evaporated milk has reached the desired depth, pour into a clean jar or pitcher and use in your favorite recipes. Store in the refrigerator for up to one week.
- To clean the slow cooker, simply fill the slow cooker insert with water and let sit for 6-8 hours, then scrape off any baked on gunk with a spoon and polish it smooth with a bit of baking soda. If it needs to be resoaked (which was regularly the case with my pots and pans when I did this on the stovetop, but not yet once with a slow cooker), place white vinegar and baking soda together in the insert to form a paste. Let foam, then dab the paste thickly onto the stuck on food. Let sit for 1-2 hours, then refill with water and let sit another 4-6 hours. Rinse off and wash as normal.
- 7 cups of milk
- 2 cups liquid sugar (maple syrup, honey, etc) OR crystalline sugar (evaporated cane sugar, sucanat, etc)
- 4 tablespoons butter
- 2 teaspoons vanilla extract
- First, pour 3 1/4 cups of water into the empty slow cooker and use a ruler to measure the depth. Note this measurement, as this is the depth your milk will be when it is finished.
- Pour water out and place the milk and the liquid sugar in the slow cooker and stir to combine. Heat on low for 19-21 hours with the lid off. (If you're using a crystalline sugar, whisk it regularly during the first hour after it begins to steam in order to fully dissolve the crystals. Remove the skin that forms on the top periodically, especially toward the end of cooking, but don't scrape up any milk that cooks onto the sides.)
- When the sweetened condensed milk has reached the desired depth, pour into a large bowl and add the butter and the vanilla. Once the butter is melted, whisk well and pour into a clean jar or pitcher and use in your favorite recipes. Store in the refrigerator for up to one week.
- Note: Using a liquid sugar is the easiest method by far when using a slow cooker to make homemade sweetened condensed milk, but liquid sugars tend to be highly flavorful as well, so they may not be appropriate for your final outcome. I find maple syrup provides my favorite, most multi-functional sweetened condensed milk, but if you need something more flavor-neutral, use an evaporated cane sugar.