The Most Delicious Old Fashioned Fudge Recipe

The Most Delicious Old Fashioned Fudge Recipe
This homemade fudge recipe is so good! It's rich and full of chocolatey flavor! Although this recipe is slightly complicated, the end result is completely worth it! Try out this recipe and let me know what you think!
Ingredients
3 cups granulated sugar
1 cup whole milk
2 Tablespoons light corn syrup
2 oz unsweetened chocolate broken into pieces (100% cocoa)
3 Tablespoons salted butter room temperature ( divided )
1 teaspoon vanilla extract