Hearty Vegetarian Stew with Couscous

Heat olive oil in a large saucepan over medium-high heat. Cook onion and garlic in the hot oil until softened, about 5 minutes. Add potatoes, squash, beans, tomatoes with juice, vegetable broth, cumin, and coriander; bring to a boil. Reduce heat and simmer until squash and potatoes are soft enough to eat, 30 to 50 minutes.

Ten minutes before the stew is finished cooking, bring 1 3/4 cups water to a boil in a saucepan. Stir in couscous; cover, and remove from the heat. Let stand for 5 minutes, then season with salt and stir in butter.

Remove stew from the heat and stir in lime zest, 1/2 of the cilantro, and 1/2 of the mint.

Serve stew next to couscous on a plate with a tablespoon of yogurt. Sprinkle with remaining cilantro and mint and serve with a lime wedge.