Russian Vinaigrette Beet Salad

INGREDIENTS

• 3 large beets
• 1 large potato
• 3 carrots, peeled and cut into fourths lengthwise
• 1/2 red onion, diced
• 3 pickles, diced
• 10 marinated mushrooms, diced
• 1 (15 ounce) can garbanzo beans, drained
• 1 (15 ounce) can black beans, drained
• 1 (15.25 ounce) can whole kernel corn, drained
• 1 (15 ounce) can green peas, drained
• 5 green onions, chopped
• 1 1/2 tablespoons vegetable oil
• 2 tablespoons chopped fresh dill, or more to taste