Heat a large nonstick pan at medium heat and cook the ground beef until brown, stir continuously with a wooden spoon.
Drain the grease and add the chopped onions, carrots, and celery.
Stir and cook for 1 minute.
Add garlic, peppercorn, and cumin with some water.
Stir and cook for another 1 minute.
Add the bell pepper, tomato, tomato paste, and beef bouillon.
Stir and continuously cook until the vegetables are soft.
Add 9 cups of water and add the potato cubes to the pan.
Turn the heat down to low and cover the pan with a lid.
Cook for 10 to 15 minutes, or until the potatoes are cooked, adding salt as desired.
Heat vegetable oil in another skillet at medium heat.
Add the pasta shells and stir with the wooden spoon continuously.
Cook the pasta shells until golden brown.
Add the pasta shells and chopped cilantro to the pan and cook for 15 minutes or until the shells are well-cooked with a lid.
Remove the pan from heat and serve on a bowl.