Nana's Pecan Pralines

My nana sent me this recipe, I haven't tried it yet.

3 cups firmly packed brown sugar
1/4 tsp cream of tartar
1/8 tsp salt
1 cup whole milk
2 tbsp butter
1 tsp vanilla
2 1/4 cups pecan halves

Combine sugar, cream of tartar, salt and milk in a heavy saucepan. Stir over low heat until sugar dissolves - wipe crystals occasionally from the side of the pan.

Cook to 238 degrees or until mixture forms a soft ball in a cup of water. Cool to 220 degrees.

Add butter, vanilla and pecans; beat until creamy.

Drop from a large spoon onto a buttered surface or wax paper.

Makes 1 1/2 - 2 dozen pralines.