Bring the vegetable broth to a slow boil on the stove. Add in the potato purée, tomato sauce, soy sauce, turmeric, and the oregano. Stir to incorporate.
Add in the pasta shells and water, then stir again.
Let cook on high for 3 minutes with the lid off the pot. Stir and reduce to medium-high heat and let it cook for 5-6 more minutes with the lid off. Stir occasionally.
One the pasta is fully cooked and al dente, turn off the heat. Put the lid on the pot, and let it sit for 10 minutes to thicken up and cool down enough to serve.
Serve in soup bowls