Preheat oven to 350 degrees and place oven rack in the center position.

Brown pork sausage and chopped yellow onion in dutch oven on medium/high heat until the pork is mostly cooked through and the onion is softened. (about 5 minutes)  Transfer the pork/onion mixture to a bowl (reserve fat in dutch oven).

Add the rice to the reserved fat and saute, while stirring frequently, until rice is light golden color for about 10 minutes.

Scoop pork and onion mixture into dutch oven and add in water, pepperoncini, pepperoncini juice, seasoning and mexicorn.  Bring this mixture to a boil.

Cover dutch oven and bake until rice and tender and liquid is absorbed (about 30 minutes).  Stir mixture after 15 minutes.

Remove dutch oven and stir, fluffing up the mixture.  Stir in fresh chopped cilantro and serve in bowls.  Spoons are the best utensil for this dinner.  Much easier to scoop out all of the goodness.