Meanwhile, cover baking sheet with foil; spray with cooking spray. Coarsely chop remaining nuts. Bring sugar and remaining water to boil in small saucepan on medium-high heat; simmer on medium-low heat 5 min. or until deep golden brown in colour, stirring occasionally. Stir in nuts, butter and baking soda. (Mixture will foam.) Spread onto prepared baking sheet; cool completely.