Combine the roma tomatoes, onion, garlic, and Knorr chicken bouillon and blend until smooth. You should have about 1 cup of tomato sauce. Pour through a fine mesh strainer and remove leftover solids.*If you prefer a thicker texture, don't strain the tomato sauce. I like my fideo more on the soupy, thinner side so I always strain it.
Heat the oil in a large pot over medium heat. Add the fideo pasta and move it around frequently for 2-3 minutes until it becomes a light brown color.
Pour in the blended tomato sauce and 1/2 cup of canned tomato sauce (I recommend El Pato Hot Tomato Sauce for a little spicy kick). Cook for 1-2 minutes and adjust the heat if needed.
Add 6 to 7 cups of water and stir to combine. Taste the soup and add salt as needed. I add about 1/2 tsp. Bring to a simmer.
Add the cilantro, then cover and reduce the heat to low for 10 minutes or until the fideo is cooked through.
Serve immediately with your choice of toppings. My family eats it with bananas and sour cream, but I also love it with a corn tortilla and mayo!