Lamb Shanks with Potato Mash - A better choice!

Ingredients

• 2 tbsp olive oil
• 4 lamb shanks
• ½ brown onion, chopped
• 2 carrots, peeled and chopped
• 2 celery sticks, chopped
• 2 garlic cloves, minced
• 1 tbsp sage, minced
• 2 tsp thyme, minced + more for garnish
• 1 tsp rosemary, minced
• 1 bay leaf
• 1 cup red wine
• 1 can diced tomatoes
• 2 cups chicken stock
• Salt and pepper, to taste
• Potato mash, to serve