2 tablespoons extra virgin olive oil
1 large onion (chopped)
2 carrots (cut into discs)
3 cloves garlic (grated)
1 inch ginger (grated)
2 teaspoons curry powder
½ teaspoon turmeric powder
½ teaspoon ground cumin (optional)
¼ teaspoon red pepper flakes (add more or less to taste)
6 cups vegetable broth (or more if needed)
1 can (15 ounces) crushed tomatoes
1 cup mung beans (whole, dry, uncooked)
1 pound potatoes (peeled and cut into bite-size chunks)
1 teaspoon salt (or more to taste)
2 twists black pepper
1 lemon