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Using the tip of a sharp knife, split open the vanilla bean lengthwise. Using the edge of the knife blade, scrape the seeds from the vanilla bean. Set aside.
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Cream butter and sugar until light and fluffy. Add eggs and beat well. Add milk, vanilla, and vanilla bean seeds. Beat just until combined.
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In separate bowl, sift or sieve flour, cream of tartar, soda, salt, cardamon, and nutmeg. Add to liquid ingredients and stir just until flour mixture is combined with liquid ingredients.
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Chill dough for 1-2 hours.
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Preheat oven to 375°F. Line baking sheets with parchment paper.
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On floured surface, gather dough together and roll out dough to a scant ¼" thickness. Cut into desired shapes.
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Decorate with raisins and/or sprinkle of sugar, if desired.
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Place on parchment-lined baking sheets, spacing cookies about 1½" apart. Chill cookies in refrigerator for 10-15 minutes. Remove and bake for 8-10 minutes. Immediately transfer cookies to wire racks to cool.