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Place the flour, yeast, sugar, 2 tbsp of the olive oil and the salt into a large bowl. Stir to combine.
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Gently pour in the water and bring the mixture together using a rubber spatula. It should be completely combined.
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Transfer the dough to a lightly oil surface and using lightly oiled hands, bring the dough together and knead well for 5 minutes until soft and elastic. It may take longer than this time, but don't be discouraged, it will soften. If the dough sticks to the counter at all, add a little more oil.
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Transfer the dough to a lightly oiled bowl. Cover with a damp tea towel and let it rise in a warm spot, until almost doubled in size (should take about 45 minutes, depending on the temperature of your room)
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Preheat the oven to 425F
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While the dough is proofing, toast the hazelnuts in a heavy bottomed skillet over medium heat. After about 8-10 minutes, they should be fragrant and turning brown. Turn the nuts into a dry tea towel and wrap them well. Rub the towel all over the nuts, releasing the skins. Shake and rub. You should be able to pull out all the nuts from among the skins and place them on a cutting board. Finely chop these and place them into a medium bowl.
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Place the sesame seeds into the same skillet and toast gently till just turning golden. Add these to the hazelnuts. Add the ground cardamom and stir the contents of the bowl together.
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On a lightly floured surface roll the proofed dough out into a 12x16" (30x40 cm) rectangle, with the 16" going across, so that you are facing a rectangle set in landscape position.
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Using a spatula, spread the dark chocolate hazelnut spread across all the dough, just leaving a 3/4 inch (2cm) border along the top edge.
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Give 5-6 shakes of the cardamom bitters over the spread evenly.
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Sprinkle the orange zest over the spread evenly.
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Then scatter all the nuts and seeds over the dough (except for 1 tbsp!)
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Starting with the longest edge in front of you, at the bottom, roll the dough up evenly and firmly. Make sure the seam is along the bottom when finished.
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Using a brush, spread out the remaining tbsp of olive oil all along the top of the roll.
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Sprinkle the remaining tbsp of nuts and seeds across the top of the roll, over the olive oil. Push these gently into the dough so that they are secure.
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Using a sharp knife, cut the roll into 10 even pieces.
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Transfer these to a parchment lined baking sheet.
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Bake on the centre rack until golden brown, or about 10 minutes.
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Remove from the oven, let cool 2 minutes and then dust with the confectioners sugar. Cool on a wire rack.