Braised Cabbage with Apple and Mustard

Ingredients

• 2 tbsp unsalted butter
• 2 cups onions (peeled and finely sliced)
• 4 sprigs fresh thyme
• 2 1/2 tsp salt (divided)
• 1 1/2 tsp freshly ground black pepper (divided)
• 2 tbsp grainy mustard
• 3 cups apples ((Northern Spy, McIntosh or Cortland all work well), peeled and julienned)
• 10 cups Savoy cabbage ((approx. 1 small head), quartered and finely sliced)
• 1 cup buttermilk
• 1 cup whipping cream