Line a rectangle or square 8x8 pan with parchment paper and spread a light coating of softened butter onto paper. Set aside
To a medium sized heavy bottom pot add 1 can of evaporated milk and sugar. The milk to sugar is a 1:1 ratio, measuring equal portions
Place pot over a low flame to bring milk to a slow boil. Do not stir as tiny bubbles begin to line pot perimeter
Once sugar has dissolved and milk comes to a boil, begin stirring in figure 8 motions and bring heat to a medium heat
Periodically stirring bring bubbles from the side to the middle, the milk will evaporate and over 10-20 mins the mixture will thicken
After 20-25 mins the milk should reduce and mixture thicken. Slightly lower the heat and tilt the pot one side puddling the mixture and begin whipping the milk vigorously for a few minutes. This will pop any air bubbles and smoothen fudge from any crystals
Once liquid has fully evaporated and milk mixture reduces into a thick fudge texture remove from heat and pour into parchment lined pan. The fudge mixture will be hot so be careful when handling
Using an offset spatula to smooth and flatten into a tight compact fudge. Spread into pan and flatten evenly. Leave to set and cool for 20 mins
Once cool, score pieces and cut into 9-12 peices depending on thickness