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Grace a baking sheet and reheat
oven temperature to 350F (175C)
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First in a big bowl mix sugar and
vinegar.
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Add plain yogurt, corn oil,
butter, egg and an egg white and stir to mix.
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Sift together dry ingredients and
add it to the bowl. Mix it to a soft dough.
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Finally add walnuts and olives and
knead to mix them together.
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Make round shapes about 2 inch
diameter. Put it in the prepared sheet.
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Mix the egg yolk with 1-1/2
teaspoon milk and with brush the top of the biscuits with it. If you prefer
sprinkle with sesame seeds or sunflower seeds or black seeds
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Bake for about 25 min. until
golden brown.