1 1/2 c. chopped coarse walnuts
2/3 c. butter
1 c. packed light brown sugar
1 (14 oz.) can sweetened condensed milk
1 1/2 tsp. vanilla

Line an 8 inch pan with foil, letting the foil extend over sides; grease lightly. Spread nuts in the bottom of the pan. Melt butter, sugar, and milk. Then cook until sugar is completely melted and it turns to a caramel color and thickened. Add vanilla and nuts. Spread in the pan; cool, then refrigerate until firm (2 to 3 hours). Remove foil and cut into squares.