English Toffee
["1 lb. butter or margarine", "2 Tbsp. water", "2 c. sugar", "1/2 tsp. salt", "2 c. finely chopped walnuts", "1 (8 oz.) bar milk chocolate"]
["Combine butter and water in a 4-quart Dutch oven; cook over medium heat until butter melts.", "Add sugar and salt, mixing well. Bring to a boil, stirring constantly.", "Boil gently until mixture begins to lighten in color.", "Add 1 cup walnuts; continue cooking, stirring constantly, until candy thermometer registers 298\u00b0.", "Pour syrup mixture into a buttered 15 x 10-inch jellyroll pan, spreading to edges of pan.", "Cool slightly; mark into 1-inch squares with the sharp edge of a knife.", "Cool thoroughly.", "Melt chocolate in top of a double boiler over boiling water.", "Spread chocolate over fudge; sprinkle with remaining walnuts. Let stand until chocolate is firm.", "Break into squares.", "Yield:", "About 3 pounds."]
["butter", "water", "sugar", "salt", "walnuts", "milk chocolate"]