Bring a large pot of water to a boil, salt to taste. Boil fettuccinepasta according to package directions.
In a large skillet over medium heat, add the butter and shallots and saute until beginning to lightly brown (don't burn).
Add the pear chunks and quickly saute, about 2 minutes. Add the bluecheese, heavy cream, and peas and stir to combine. Season with salt and pepper, to taste. Turn down to low.
Add 1/3 cup of the pasta water to the pear mixture and then add the pasta. Toss to coat, sprinkle with walnuts, and serve immediately.