Cottage Pie with Mashed Yams

We found this yummy recipe on the Nourished Kitchen blog and just had to try it (with our own additions and modifications, of course)!

Ingredients:

1 pound grass-fed ground beef
1 cup beef stock
1/3 cup cream
1 stick butter
1 large onion, chopped
1+ cup frozen peas
1+ cup diced carrots
3 medium sized yams or sweet potatoes
2 cups shredded cheese
1 tablespoon arrowroot powder
1 tablespoon finely chopped fresh rosemary
1 teaspoon dried thyme
2 tablespoon tomato paste
1 teaspoon Worcestershire sauce
sea salt and crushed black pepper to taste

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