Salmon with Fennel and Pernod

Ingredients:

1 1/2 teaspoons fennel seeds, crushed
1/4 cup (1/2 stick) butter, room temperature
2 tablespoons minced shallots
1 large fennel bulb with fronds; bulb quartered, then cut lengthwise into 1/4-inch-thick slices; 2 tablespoons fronds chopped, divided
2 6- to 7-ounce salmon fillets
2 tablespoons Pernod or other anise-flavored liqueur

Directions:
Stir fennel seeds in large nonstick skillet over medium heat until fragrant, [...]