Rinse anchovies, dab dry (water salty anchovies for about 10 minutes). Cut ham slices in half crosswise. Wash the sage, dab dry and remove the leaves. Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Line a tray with baking paper.
Wash the potatoes thoroughly and hollow them out slightly lengthwise with an apple corer. Fill each potato with 1⁄2 slice of ham, 1 anchovy and 1-2 sage leaves, best to roll up anchovy and sage in the ham.
Put the potatoes and the cut out inside on the tray. Sprinkle with 4-5 tablespoons of oil and season with sea salt. Spread any remaining sage leaves on top. Roast in a hot oven for about 50 minutes.
In the meantime, clean the chillies for the mojo, cut lengthwise, remove seeds, wash and chop. Peel and chop the garlic. Puree both with 2 tsp. cumin, 1 tsp. paprika, 1⁄2-1 tsp. salt and 100 ml oil with a hand blender. Season to taste with vinegar. Take the potatoes out of the oven and arrange with mojo.