In a medium-large pot or dutch oven, warm the oil over medium heat. Stir in the onion, celery, garlic and ½ teaspoon salt. Cook for 5 minutes, stirring occasionally or until very soft.
Stir in the tomato paste and paprika and cook for another 1-2 minutes, stirring often, to caramelize the tomato paste.
Stir in the water, potatoes, beets, carrots, and remaining ¾ teaspoon salt. Bring to a boil over high heat, then reduce the heat to medium-low to maintain a rapid simmer for 15-20 minutes or until the potatoes are easily pierced with a fork, stirring halfway.
Turn off the heat and stir in the vinegar. Let it cool off for a few minutes. Serve topped with sour cream, herbs, and pepper.