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1
Dissolve the yeast in a 1/2 cup (125 ml) of the water and let sit 10 minutes. Place the flour in a large bowl and add the yeast, the butter and salt and begin mixing in the rest of the water until you have a soft but not too sticky dough - mix it in a little at a time and see how much of the water you actually need, all flours absorb water differently so you may not need all of it, you may need a little more. If you go too far and find it much too sticky to knead, you can add a little more flour to adjust.
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2
Knead the dough on a clean, floured surface for about 10 minutes or until smooth and supple. Set aside a small ball of the dough, about 80 grams or the size of a mandarin, and wrap in plastic. Set aside the dough (no need to cover it, you'll be back to it in a moment), while you prepare the rest of the ingredients. Pull the skin of the salame and chop into cubes no larger than 1cm (about 1/3 inch) cubes. Chop the cheese into similar sized cubes.
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3
Heat oven to 350u00b0 F (180 C).
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4
Roll out the dough into a long rectangle, roughly 1 cm (1/3 inch thick). It's not so important how long the short side is but just make sure that the dimensions of the long side are more than the circumference of your pan. Sprinkle over the cheeses and salame to cover the surface completely, then dust generously with black pepper. Roll up the dough from the long side (an extra set of hands is really handy here) so that you have a long log and place, opening down, in the ring tin, overlapping the two ends.
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5
Place the 4 whole eggs, evenly spaced, on top of the dough. Take the small ball of dough that was set aside earlier and roll out logs about 1cm (1/3 inch thick). Use these strips to seal the eggs on the top of the casatiello in a cross shape. Brush the whole thing with the yolk and bake. It should take about 1 hour. The top should be golden brown and when tapped should sound hollow.
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6
Let cool slightly before turning out of the pan and serve in slices, warm or cold. This makes a great picnic bread.
