Start boiling pasta according to package instructions, drain and set aside once complete.
While your pasta is boiling, make the sauce. Heat your pan on high.
pour in your oil and ground beef. Break up the beef into small chunks and fry in the oil until very well browned and foamy.
Then add in your seasonings and onions. Stirfry for a minute then add in your tomatoes. Press the tomatoes with your spatula to break them up into small pieces. Cook until all the water evaporates.
Add in your green bell peppers, stirfry another minute, then add in a cup of water and let the pot simmer on low for about 15-20 minutes until all the veggies are soft. Add more water to keep from burning if needed.
One all the veggies are soft, use your spatula to mash them up in the pan. Let all the water cook out then stirfry the beef and mashed veggies in the oil that comes out for another 5 minutes, the red oil should start foaming golden.
Add in some extra cumin for flavor (optional)
Once nice and fried, add in your cooked shell pasta and mix into the sauce very well, keeping your pot on low to heat the pasta back up a little.
Top with cheese and a sprinkle of chopped cilantro and serve hot, enjoy!