1. Add the parsnips to a medium pot and cover with water. Bring to a boil and reduce heat to a simmer for 20-25 minutes until parsnips are soft and tender.
2. Remove the parsnips from the heat, strain the water and allow them to cool.
3. In a medium pan, melt 1 tbsp of the cooking fat and add the diced onion and a pinch of salt. Stir until onions are soft and cooked. Remove from heat and set aside in a small serving bowl.
4. Once the parsnips are cooled, add them to a high speed blender or food processor along with the cooking fat, salt, garlic, and thyme. Blend until combined.
5. Serve the parsnip mash in a large serving both with onions, green onion, and diced bacon on the side for toppings. Salt to taste!