3 c. unsweetened apple juice (use apple wine if available)
1/4 c. finely chopped shallot
1 tbsp. fresh thyme leaves (or 1 1/2 tsp. dried)
1/4 c. grated Rhode Island Greening or other tart apple
2 tsp. lemon juice
1/2 tsp. black pepper
4 lb. mussels, cleaned
1 1/3 c. heavy cream
8 tbsp. butter (1 stick)