I used a heavy 12-inch skillet for this, and then used the same skillet for frying the bases.
Set your skillet on a medium-high heat and add 2 tablespoons olive oil. Let the oil heat for a minute then add the fennel and onion. Drop the heat to low-medium and gently stir fry until the onion and fennel have softened but not taken on any color – about five minutes on that low-medium heat.
Now add the sun-dried tomatoes, finely chopped serrano peppers, capers and black pepper. Continue stir frying for another 2 minutes and then turn the lot into a bowl ready for topping the bases once you’ve rolled and fried them.
**Rolling and frying the bases
Once the dough has had its hour’s rising, turn it out of the bowl and use your hands to form it into six evenly sized balls.
On a flour-dusted surface, roll each ball into a circle that’s 1/3 of an inch thick and about 8 inches in diameter. Let each base sit and rise a little for 15 minutes before you start frying each one hot-and-fast.
To do that, set your skillet onto a high heat and add a tablespoon olive oil. As soon as the oil starts shimmering, but not smoking, drop the heat to medium-high and add your first rolled base. It will start to swell and bubble almost at once which is exactly what you want. Let the base fry on that medium-high heat for 2 minutes, then carefully – and I mean carefully – turn it over and let it sizzle away for another 90 seconds.
Remove the base and set it aside on kitchen towel to soak up any excess oil. Repeat this hot-and-fast frying for the next 3 bases, keeping each one separate from the others.
For this frying, bear in mind that you’re aiming to give what will be the underside of each base a good golden, crisping color, with a few spots of char. The upper-side, which gets the topping, doesn’t need to be fried to the same extent because its edges are going to get the full heat of your broiler / grill.