Preheat the oven to 350 degrees F.
Mash sweet potatoes and combine with all of the other ingredients. Pour into pie shell and bake until firm, about 35 to 40 minutes.
Add the salt, vanilla and the lemon juice to egg whites. Beat until foamy. Add 6 tablespoons sugar, 1 at a time. Beat until sugar dissolves and mixture forms stiff peaks.
Combine the sugar, corn syrup, butter and vanilla in a medium saucepan. Cook and stir on medium heat until butter is melted and mixture is blended. Remove from heat.
Spoon dollops of meringue in ring around outside edge of pie. Sprinkle pecans over the center of the pie. Drizzle all or part of the praline topping over the nuts, as desired. Bake for 15 minutes or until golden brown. Cool to room temperature before serving. Refrigerate leftover pie.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.