Coarsely chop the walnut kernels. Crumble yeast, dissolve in 1⁄2 l lukewarm water. Mix flour and salt in a bowl. Add yeast water, walnuts and vinegar. Knead with the dough hooks of the hand mixer for about 3 minutes until smooth (dough is relatively liquid).
Immediately fill the dough (do not let it rise!) into a greased, flour-sprinkled box form (25 cm long; 1 1⁄2 l). Bake in the preheated oven (electric cooker: 225 °C/circulating air: 200 °C/gas: level 4) for 30-35 minutes.
If necessary, leave to stand for another 5 minutes in the switched-off oven. Turn out the bread and let it cool down on a cake rack for at least 3 hours.
For the spread, peel the mango, cut the flesh off the stone. Puree mango, apricots and lemon juice. Season with ginger. Cut bread into slices. Add the spread.