Add the prosciutto, FGBP, and half a teaspoon of the salt and cook for 2 minutes. Then, fold in the peas and cook until they are softened, about three minutes.
Add a half teaspoon of salt to each pot of pasta water and add the spinach pasta to one pot and the regular pasta to the other. Cook each until al dente.
Add the remaining butter to the prosciutto mixture and follow with the cream after the butter melts. Bring to a boil for about 1-2 minutes and stir in the Romano cheese. Add one-third to one-half a cup of pasta water from each pot to the saucepan. (2/3 to 1 cup total.) Mix thoroughly for about a minute and remove from heat.
Drain the pasta when it is al dente and transfer to a large bowl. Mix in the sauce and serve immediately with grated Romano cheese on the side.
Notes
Suggested wine pairings: Alberiño, Pinot Grigio or Pinot Gris.