Boil the potatoes in well-salted water until completely tender all the way through, about 20 to 25 minutes. Do not undercook them. A knife should pass through with no resistance. Drain and let them steam dry for 5 minutes.
Preheat oven to 450°F. Pour a generous amount of Graza Sizzle onto a sheet pan and place it in the oven for 3 to 4 minutes until the oil is shimmering and very hot. This is the step that makes the difference between a good smashed potato and a great one. The contact between cold potato and hot oil is what creates the crust.
Transfer the potatoes to the hot oiled pan and smash each one firmly with the bottom of a glass or a fork until flat but still in one piece. The edges should be ragged and lacy. Do not be gentle. Drizzle more Graza Sizzle generously over the top of each potato. Season aggressively with flaky salt and herbs if using.
Roast for 20 to 25 minutes until deeply golden and crisp on the bottom. Flip each potato carefully and roast for a further 10 minutes until crisp on both sides.
Serve immediately on a platter with an extremely generous amount of Graza Garlic Aioli alongside or spooned directly over the top. The aioli should pool into the cracks and crispy edges of the potatoes. This is not the moment for restraint.