Pumpkin Spice Toffee

and 1/2 cups (150g) chopped unsalted pecans

(2 sticks; 230g) unsalted butter, cut into pieces

warm water

+ 1 Tablespoon (215g) granulated sugar, divided

salt

light corn syrup

and 1/4 teaspoons pumpkin pie spice, divided*

quality white chocolate, coarsely chopped*

x17-inch (or similar size) rimmed baking sheet

wooden spoon

silicone baking mat (highly recommended)

heavy duty saucepan (or this pan or this pan)

pastry brush

candy thermometer