Mix together sugar, cocoa, corn starch and salt in a medium saucepan. Gradually mix in milk. Cook and stir over medium high heat until thickened and bubbly. Reduce heat to medium low; cook and stir 2 minutes more. Remove pan from heat. Stir about one cup of the hot filling into the egg yolks; mix back into the custard. Return saucepan to heat, and bring to a gentle boil. Cook and stir for 2 minutes. Remove from the heat, and stir in vanilla. Pour hot filing into crust. Spread meringue evenly over hot filling, sealing to crust.
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