Score the pork rind (about 1cm apart) using a super-sharp chef’s knife or a craft knife (Stanley knife). I find the latter works best. You want to cut through the rind and into the fat, but not the meat. Pat the roast dry and place, uncovered, in the fridge for at least five hours (but preferably overnight). This helps to dry the rind out a bit, making for extra crisp crackling. Heat the oven to 245 degrees Celsius. Grind the fennel seeds and salt together in a pestle and mortar until fine. Rub the roast with olive oil and sprinkle all over with the fennel salt mix. Ensure that you rub it into the cuts as well.
Place vegetables in a roasting tray. Drizzle with a touch of olive oil (a teaspoon should do the trick) and toss to ensure the veggies are all very lightly coated. Place the meat on top of the vegetables and place in the oven. Turn temperature down to 220 degrees Celsius after 15 minutes and roast for a further 40-50 minutes. Remove from the oven and insert a meat thermometer into the thickest part of the roast. If it is 63 degrees Celsius (145 degrees Fahrenheit) in the middle, it’s ready. (Old school says take it to 70 degrees, but pork dries out easily, so if you want it juicy, 63 is what you want.) If your crackling is not ‘crackly’ enough for your liking at this stage, turn your grill on. As soon as it’s red hot, pop the pork under it for a minute or two. Don’t overdo it, as you will overcook your pork. Like all meat, this pork roast should rest a bit before you serve it. Bear in mind also that crackling bits that may look a bit soft, will crisp up as the pork rests. Remove the roast from the pan. Keep the veggies in the pan and place it on a low heat. Add a few tablespoons of apple cider or juice to the pan to deglaze it. Stir to dissolve all the lovely dark, crusty caramelised bits on the bottom of the pan. Strain and set aside to serve with the pork.
While your pork is in the oven, wash and peel the sweet potatoes. Cook in boiling water with a generous pinch of salt until soft. Mash and add enough orange juice to get the consistency you like. Add black pepper and salt to taste. You need more than you think because, you’ve got it, salt is flavour! You can make the mash up to this point beforehand, then warm it through and add the brown butter just before you serve. To make the sage brown butter (beurre noisette), melt the butter in a stainless steel pan. Black-bottomed pans, like non-stick ones, are not great to use for this, as it’s harder to tell when the butter is brown. Pop the sage leaves in. The butter will start foaming after a few seconds and then start browning. When it is a lovely nutty colour, it’s ready to pour out.
This entire process only takes a minute or two, so keep an eye on it throughout and remove the sage leaves as soon as they start crisping. (If you take it too far and the milk solids burn and become black, throw it out and start again.) Stir one tablespoon of the brown butter through the warm mash. Then drizzle the remaining butter over the top and scatter over the sage leaves. A final grinding of black pepper and maybe a pinch of Maldon salt and you’re ready.