It’s a myth that you need goose fat to make good roasties. Roast Potatoes with Garlic & Rosemary (The Veg Space) are easy to make. You can prepare them ahead of time, or even freeze them.
Don’t feed leftover potatoes to pets, birds or wildfowl as it usually has salt, chives or butter (can smear on feathers, affecting waterproofing/insulation). If giving pets an occasional treat, just feed plain mash potato. Read more on food safety & people & pets.
Do you know your spuds? Maris Piper can be used for anything (chips, baked, boiled, mashed or roast). Russett are also good for chips, as are King Edwards (also good for roasting and baking). Waxy red-skinned Desiree potatoes make good mash, and Jersey Royals are good boiled with herbs and palm-oil-free vegan butter.
You don’t need goose fat to make good roast spuds (use rapeseed oil, which is kinder and supports local farmers). Try these roasties from Welsh chef Gaz Oakley.
Classic Roast Potatoes (So Vegan) use Maris Piper or Yukon Gold, for a fluffy texture. Let them cool before adding to hot oil, to remove moisture (keeps them crispy).