Build the flavor base: Heat 2 tablespoons olive oil in a large pot or Dutch oven over medium heat.Add 1 large onion (chopped) and 2 carrots (thinly sliced) and cook for 3 minutes. Add 3 cloves garlic and 1 teaspoon ginger (grated), 2 teaspoons curry powder, 1 teaspoon turmeric powder, 1 teaspoon ground cumin, and ¼ teaspoon red pepper flakes. Cook for 1 minute, stirring often.
Add the soup ingredients: Pour in 5 cups vegetable broth and 1 can crushed tomatoes.Rinse and drain 1 cup dried lentils, then add them with 1 pound potatoes cut into bite-size chunks and 5 ounces kale (chopped). Season with 1 teaspoons salt and ¼ teaspoon black pepper.
Simmer the soup: Bring to a boil, then lower the heat and gently simmer for about 30 minutes, stirring occasionally.The soup is ready when the lentils are tender and the potatoes are easily pierced with a fork. Add a splash of broth if it gets too thick.
Taste and serve: Taste and add more salt and pepper if needed.Serve with a squeeze of lime and your favorite toppings, such as Greek yogurt, brown rice, pickled red onions, scallions, or cilantro.
Substitutions
Olive oil → Avocado oil
Onion → Shallots or leeks
Carrots → Parsnips
Garlic → Extra ginger or scallion greens
Ginger → Ground ginger
Curry powder → Mild or hot curry powder
Turmeric → Extra curry powder
Cumin → Ground coriander
Red pepper flakes → Cayenne or omit
Vegetable broth → Low-sodium vegetable broth
Crushed tomatoes → Diced tomatoes
Green or brown lentils → 2 cans lentils, drained and rinsed; see FAQ for method
Potatoes → Yukon Gold, red, or russet potatoes
Kale → Spinach or Swiss chard
Salt and black pepper → Adjust to taste
Lime → Lemon
Greek yogurt → Low-fat Greek yogurt or Skyr
Tips
Choose the right lentils: Use green or brown; rinse well, but don’t soak.
Bloom the spices: Cook them in olive oil for 1 minute for more flavor.
Watch the garlic: Stir often so the garlic, ginger, and spices don’t burn.
Cut potatoes evenly: Bite-size pieces help everything cook at the same rate.
Simmer gently: Cook until the lentils are tender and potatoes are easily pierced with a fork.
Adjust the broth: Add more if too thick; blend or mash a little soup if too thin.
Finish with lime: It brightens the warm spices and tomatoes.
Salt last: Taste and adjust after cooking since broths vary.
Store: Refrigerate leftovers and add a splash of broth when reheating if the soup thickens.