Tagliatelli with Mushrooms, Browned Butter, and Rosemary

Saute the musrooms in 1 T butter over medium low heat until browned and crispy, about 10-15 minutes.

Remove mushrooms with a slotted spoon. Add remaining 3 T butter, brown, then remove from heat and add lemon zest, rosemary, and salt.

Serve over tagliatelle and garnish so it's pretty