Potato Poblano Soup

Hearty stew for a chilly day with the power of cruciferous vegetables.
1 teaspoon vegetable oil
1 cup red onion, diced
2 cloves of garlic, minced
3 poblano peppers, diced
1 teaspoon salt
1 teaspoon cumin
6 cups vegetable broth
2 pounds red potatoes, diced
½ bunch of kale, ripped in bite-size piece
1 Tablespoon red wine vinegar
Heat the oil in stockpot over medium heat. Add onion and cook until softened. Add garlic, peppers, salt and cumin. Cook for three or four minutes, stirring frequently. The onion should be getting translucent. Stir in the broth and potatoes. Bring to a boil and then reduce to a simmer. Add kale on top and cover. Cook until the potatoes are soft, about 10 minutes. Stir in vinegar and additional salt to taste, if needed.