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You're going to love this Chard, Lentil, & Potato Slow Cooker Soup. It's filling, easy to make, and totally healthy!
I own a ton of cookbooks, but if I had to choose the one I use the most often in my kitchen, it's Fresh from the Vegetarian Slow Cooker by Robin Robertson. This is my book that has notes scrawled all over the pages and food spatters on the most frequently used recipes. If you're a vegetarian and you own a slow cooker, you should really buy this book!
This recipe is adapted from a kale and lentil soup that's in Fresh from the Vegetarian Slow Cooker. It's not super fancy, it's not a show-stopper, but it's a delicious, hearty soup for a chilly fall evening. I replaced the kale with chard—and used a lot more than the original recipe calls for. We love Swiss chard, and if I was buying a whole bunch anyway, why not use it? I even threw in the stems, so nothing goes to waste! I also added some Yukon potatoes to make this soup even more filling, but sweet potatoes or butternut squash would probably be just as tasty.
How to Make Chard, Lentil, & Potato Slow Cooker Soup
Heat oil in a skillet.
Add veggies and cook until softened.
Add veggies and ingredients to slow cooker.
Cook on low for 8 hours.
Season with salt, pepper, and boiled chard leaves.
Full directions for how to make Chard, Lentil, & Potato Slow Cooker Soup are in the printable recipe card below.
Chard, Lentil, & Potato Slow Cooker Soup FAQs
Why do you love this cookbook?
The thing I love about Fresh from the Vegetarian Slow Cooker is that the recipes are mostly unfussy. You might have to sauté some ingredients before putting them in the crockpot. But other than that, things are pretty uncomplicated—which is what I like in a cookbook. I want realistic, everyday meals. I want a cookbook I can use, not one with lots of pretty pictures of recipes that are a such pain to assemble that I'll probably never make.
When I was working full-time and going to library school full-time (yeah, that happened), I worked my way through a good half of the recipes in this cookbook. They were so easy to put together! I could let them cook in the crockpot all day and dinner would be ready when we got home. Without fail, they were all winners. The best part was that there were always leftovers, so we could have them for dinner the next day or freeze them. The only thing easier than a slow cooker meal is a leftover meal! Or stopping at Chipotle on the way home from work. (Yeah, that happened too.)
You can easily freeze this soup. Simply let it cool down a bit, pour it into freezer-friendly containers or ziplock bags, and pop it in the freezer until you're ready to eat it again! I recommend separating the soup into serving-size portions so you don't have to thaw all of your frozen soup when you only want to eat one cup.
Add onion, celery, carrot, garlic, and stems from Swiss chard.
Cover and cook until softened, about 8-10 minutes, stirring occasionally.
Add cooked vegetable mixture, lentils, potatoes, broth, and soy sauce in a 4- to 6-quart slow cooker.
Stir to combine, cover, and cook on low heat for 8 hours.
Just before soup is finished cooking, bring a large pot of water to a boil. Place reserved chard leaves in boiling water and cook until tender, about 5 minutes.
Drain leaves well and stir into soup. Season with salt and pepper to taste.
Craving more veg-friendly recipes? Shop our collection of vegetarian and vegan cookbooks, including our new Vegan Thanksgiving and Vegan Christmas cookbooks!
There are affiliate links in this post, so if you click through and buy Fresh from the Vegetarian Slow Cooker, I'll get a few cents out of the deal. I promise not to spend it all in one place!
The other good news: Lentils don't need to soak as beans do (though you do need to sort and rinse them before cooking). Different types of lentils cook in different amounts of time. Red lentils are the fastest cooking and they dissolve as they cook and make for a smooth soup.
If the soup seems too thick add 1 more cup of vegetable stock (or water). Taste test and adjust seasonings as needed. Using an immersion blender or regular blender puree half of the soup (don't skip this part...the texture of smooth/chunky is the best!) Keep the soup on low heat until ready to serve.
Depth of flavour: Cooking ingredients long and slow can create a delicious depth of flavour. This soup recipe is a good example of one such dish. So is my French Onion Slow Cooker Soup.
Every time you lift the lid, heat escapes and adds up to 30 minutes longer to your cook time. Slow cookers are made so you don't have to stir with the low cooking temperature, so relax. Leave it. Only lift the lid at the end when your meal is ready, or to add last minute ingredients.
Yes, you can overcook lentils; they will become mushy. Much depends on the type of lentil you're using. Some cook quicker and hold their shape better than others. To avoid overcooking them, always follow the cooking directions in your recipe and use the type of lentils called for in the ingredient list.
Don't worry about soaking lentils, split peas, or black-eyed peas (or cowpeas). Lentils and peas are softer than dried beans. They'll cook within 5 to 20 minutes without any soaking time. Nearly all traditional cookbooks tell you to soak dried beans before cooking them.
If you eat fiber-rich lentils regularly, they can cause gas and bloating. If you are sensitive to fermentable oligosaccharides, disaccharides, monosaccharides and polyol (FODMAP) foods, lentils can cause discomfort, as well as bloating and gas in the colon.
Add aromatics to the water or, even better, use chicken or vegetable stock instead of water. Follow this tip: Add a few cloves of garlic, a bay leaf, a spring of rosemary, half of an onion, or a combination of these aromatics to the cooking water or stock to help flavor the lentils.
When cooking dal why does it create foam on the top? The grey foam that forms on top of a pan of lentils is caused by a substance in the beans called saponins. This substance lathers up in the water, just like soap – in fact, the word 'saponins' actually comes from the Latin word for soap, 'sap!
That varies by what's inside the slow cooker and also by the appliance's setting and model, the experts say. Most recipes for all-day cooking call for 6 to 8 hours on low. Quality- (and safety-) wise, another 1 to 2 hours in 'keep warm' mode won't mess things up.
"When a slow cooker is too full, it may not heat the food evenly," explains Leal. As a result, some parts of the dish may overcook, while others remain undercooked. "This can also increase the risk of foodborne illness, because the food might not reach a safe temperature throughout," she says.
The difference between "High" and "Low" on slow cookers seems to differ with every brand and model. One thing that is consistent, though, is that food takes seven to eight hours to reach a simmer point (around 210°) on low; versus three to four hours on high.
And if you dredge the meat in flour before you brown it, your sauce will thicken up to make a gravy. You should always brown ground beef or any ground meat in a skillet before adding it to your slow cooker to prevent the meat from clumping up or from adding excess grease to your cooked dish.
Most appliances will automatically shut off after 20 or so hours on this setting, but you shouldn't leave food in a slow cooker for an extended length of time. The general rule of thumb is that 2-4 hours is the maximum length of time you can leave food in a slow cooker on warm.
Lentils to do not require soaking like other pulses. Rinse your lentils with fresh water before boiling to remove any dust or debris. Cook on a stovetop, using 3 cups of liquid (water, stock, etc) to 1 cup of dry lentils. Be sure to use a large enough saucepan as the lentils will double or triple in size.
Aim to soak your beans or lentils for at least 4 hours, and preferably overnight. Dump the soaking water (i.e. don't use it to cook the beans). Then be sure to give your beans/lentils a good rinse before cooking to wash away those gas-producing carbohydrates. Introduce them slowly.
the color change you've observed is from oxidation. If you want to prevent this, lay some plastic wrap over the surface of your lentils to prevent air from getting to them, or add some acid, like lime juice, to the recipe.
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by Robin Robertson. This is my book that has notes scrawled all over the pages and food spatters on the most frequently used recipes. If you're a vegetarian and you own a slow cooker, you should really buy this book!
