In a large pot, over medium-high heat, saute onion and garlic with olive oil until fragrant, about 1 minute.
1 tablespoon olive oil, 1 small onion, 2 cloves garlic
Add potatoes, diced tomatoes, vegetable broth/stock, water, tomato paste, and tomato sauce to the pot. Stir to mix together. Bring to a simmer then lower heat to medium-low. Cover and let simmer for 20-25 minutes, or until potatoes are fork-tender.
1 large potato, 14.5 ounces can of diced tomatoes, 2 cups vegetable broth or stock, 1/2 cup water, 3 tablespoons tomato paste, 1/4 cup of your favorite marinara sauce
Uncover and stir in the kale until wilted. Season soup with salt and pepper, to taste.