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Preheat oven to 350F.
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Grease a 10x15 inch baking pan and set aside.
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Toast pecans until fragrant.
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Cool and chop roughly, set aside.
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Cream butter and brown sugar until light and fluffy, add flour and mix just until combined.
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Press dough evenly into prepared pan.
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Bake until golden 10-12 min.
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Cool on rack.
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In a heavy bottomed saucepan combine 4 cups of sugar, cream of tartar, salt, and water.
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Cook over high heat wihout stirring until tome sugar begins to melt and turn golden (2-5 min).
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Reduce heat to medium, cook stirring occasionally until all sugar is melted.
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It sould be a deep golden color (candy thermometer reading 300F).
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While stirring pour cream slowly down the side of the pan.
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When the cream is mixed remove pan from heat and add pecans.
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Pour carmel filling over the shortbread crust and return to oven for about 12 min.
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until caramel is a little darker color, turning the pan halfway during cooking (for even browning).
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Cool on wire rack and cut into bars or 1x3 inch"fingers".