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Line an 8 inch square baking dish with foil, leave a 1 inch overhang. Grease foil.
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Spread pecans on a baking sheet and toast in a 180C (350F) oven for 8 minutes or until fragrant. Set aside.
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Grease the sides of a heavy saucepan. Add the sugar, cream, maple syrup, butter and baking soda.
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Cook over a medium heat, stirring with a wooden spoon until the sugar is dissolved and the mixture starts to boil.
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Boil without stirring until 1/2 teaspoon dropped into cold water forms a soft ball (or candy thermometer reaches 114C/238F) - approximately 8 minutes.
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Pour into a wide-bottomed bowl and cool on rack until mixture is just warm to touch (1-2 hours).
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Using a wooden spoon beat in the vanilla, beating until very thick and most of the gloss disappears (approx 7 minutes).
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Quickly stir in the pecans and scrape mixture into prepared pan. Smooth the top. Let cool then use remove from pan and cut into pieces.