In a small saucepan, at medium heat, melt the sugar, butter, chocolate and milk, constantly mixing.
Remove from the heat and add the oats, incorporating with a spatula until all the oats are covered in chocolate.
Line a cake pan with some plastic wrap, lay one layer of crackers and one layer of the oats and chocolate mix. Repeat this process until the last layer of chocolate.
Pop into the fridge for at least two hours, before cutting into squares.
Notes
ASSEMBLY: Depending on the size of the cake pan, you'll get more or less layers. You can easily double the ingredients to get a more cake-size turron.
STORAGE: Store it in an air-tight container for a week in the fridge. You can also freeze it already cut in squares of any size.