Great memories of fudge, but I'm afraid that the culture of cheat fudges has made me scared to try to make real fudge myself (I don't make the cheat fudges, either, because I like real fudge better).
12 oz condensed milk
2 c sugar
4 T corn syrup
1/2 t salt
Stir until chocolate is melted and sugar is dissolved. Cook until 234 F and/or it forms a "soft ball" in cold water. Add:
4 T butter
2 t vanilla
Do not stir. Cool to 120 F and beat 5-10 minutes until no longer glosssy. Spread out on a buttered plate.