Bake 45 to 50 min. or until centre is almost set. Meanwhile, bring remaining sugar and water to boil in small saucepan on medium-high heat, stirring constantly. Continue boiling, without stirring, 5 to 7 min. or until syrup is thickened and begins to turn golden brown. Remove from heat. Stir in remaining nuts. Spread onto parchment-covered baking sheet. Cool cheesecake and nut brittle.