Sweetpotato Mummy Pie - North Carolina Sweetpotatoes

Ingredients

• baking beans
• 1 shortcrust pastry roll
• 2 tbsp olive oil
• 1 chopped onion
• 2 garlic cloves
• 2 tbsp fresh thyme
• 150 g diced pancetta
• 100 g sliced button mushrooms
• 1 large sweetpotato cut in 1cm cubes
• 1 tin chopped tomatoes