Beer and Mustard-Marinated Mackerel, and Potatoes with Roquette Pesto

Ingredients
mackerels
- 8 small mackerels (or 16 filets)
- Olive oil
- 500 g yellow-fleshed potatoes
Marinade
- 1 bottle (340 ml) amber beer
- 120 ml (1/2 cup) cider vinegar
- 120 (1/2 cup) ml olive oil
- 60 ml (4 tbsp.) course-grain mustard
- 1 onion, finely minced
- 1 celery stalk, minced
- 2 garlic cloves, crushed
- 1 shallot, minced
- 2 carrots, finely minced
- 2 bay leaves
- Pinch of fresh thyme
- Salt and black pepper
Roquette pesto
- 250 ml (1 cup) roquette
- 1 clove of garlic
- 60 ml (4tbsp.) olive oil
- 15 ml (1 tbsp.) cider vinegar
- 60 ml (4 tbsp.) grilled almonds
- Salt and black pepper
Preparation
- Heat the beer to reduce it to 120 ml, add the vinegar and olive oil and simmer for a few minutes.
- Meanwhile, quickly sear the mackerel filets in a small amount of oil.
- Place them in a dish and cover with the onion, celery, garlic, shallot, carrots, bay leaves and thyme; salt and pepper to taste.
- Bring the beer mixture to a boil, stir in the mustard, and pour over the fish.
- Marinate in the fridge for 24 hours.
- The next day, cook the potatoes in their skins in salted boiling water.
- Meanwhile, make the roquette pesto by mixing all the ingredients in a blender.
- Dice or slice the cooked potatoes and coat them with the pesto.
- Serve with the marinated mackerel.
- Garnish the plates with roquette leaves if you wish.