Preheat oven to 450 degrees
While the oven is preheating, in a large pot add water and heat until it boils. Once it is boiling, add your baking soda, salt and potatoes, bring to boil, reduce to simmer afterwards and after about 10 minutes potatoes should have little resistance but will not be fully cooked.
Drain, remove potatoes from the water, place in a large bowl and let the water evaporate slightly.
Pour over olive oil and salt and black pepper to taste.
Place on a parchment lined baking sheet and bake for 20 minutes, flip and bake for an additional 30 minutes.
You want your potatoes to be brown and crispy on the outside!
I like leaving my potatoes simply seasoned with salt and pepper but of course, you can dress with herbs of your choice or perhaps crisped minced garlic.
Set aside and serve with your roast beef and gravy, yorkshire pudding and vegetables of your choice.