Making potato wedges
Cut the potatoes with the skin on into four equal pieces.
Bring a large pot of salted water to a boil and blanch the wedges for 5 minutes. Drain and let them evaporate.
Melt the butter, season with salt and pepper, and toss the potato wedges until well coated. Place them cut-side down on a baking sheet lined with parchment paper. Bake in a preheated oven at 195°C (375°F) for 25–30 minutes, until golden brown and crispy.
Preparing oxtail stew
Season the oxtail with salt and pepper and coat with flour.
Heat butter or oil in a Dutch oven and sear the meat on all sides until golden brown. Remove from the pot.
Add the onion, carrot and garlic and fry until lightly caramelized.
Stir in the tomato puree, mustard and a tablespoon of flour and fry briefly.
Deglaze with the beer and scrape up any bits. Add the meat back in, along with the stock, thyme, and bay leaf.
Simmer gently for at least 3 hours with the lid on the pot, until the meat falls off the bone. Or, cover the pot with a lid or aluminum foil and bake for 3.5 hours at 150°C (300°F) (my preference – you won't have to worry about it).
Remove the meat, pick it off the bones and strain the sauce.
Add 1 finely chopped shallot and 100 ml port, let it reduce briefly and mix with the pulled meat.
Keep warm.
Making mustard mayonnaise
Place all ingredients in a measuring cup.
Place the immersion blender at the bottom and blend without moving until the emulsion begins. Then slowly pull it upwards until you have a smooth mayonnaise.
Season to taste and place in a piping bag.
Serve
Arrange the crispy wedges on a large platter. Spoon the warm stew over them.
Finish with dollops of mustard mayonnaise and finely chopped spring onion.
Love it extra cheesy? Grate some aged goat cheese over it.
Serve warm.