Boil and salt a large pot of water to cook the fresh pasta.
In a sauté pan large enough to hold the finished pasta, heat the olive oil and butter over medium-high heat.
Add the shallots and cook for a few minutes until soft, but not brown. Add the garlic and cook until soft. Add the lemon juice, zest and pepperoncini.
Cook the bucatini according to package directions, just a few minutes for fresh pasta. Using tongs, transfer the pasta directly from the pot into the sauté pan. Add ½ cup of the pasta water and 2 tablespoons crème fraiche.
Coat pasta with sauce, adding more pasta water if needed. Fold in crabmeat and parsley.
Adjust seasoning, adding more pepperoncini, lemon or salt if desired.