Coat the rim of a small saucepan with the margarine, it will help prevent boiling over
Get your pan of choice ready. You can use a baking pan or small individual molds. Coating with a light layer of oil might help get the candy to release but it might change the colour of the top of the candy (it won't affect the flavour). If you are using an 8x8 baking pan I suggest 2 cups of maple syrup at least. You can cut it into squares when it is ready. Silicone molds are an awesome choice for this candy.
Boil the maple syrup until it reaches the soft ball stage, 240 degrees
Remove from heat for 5 minutes, leave it alone
After 5 minutes start to stir the maple syrup, it will start to bubble and eventually start to change to a lighter colour and get a bit of texture. Pour into your molds or baking pan quickly. It will start to cool and seize up quite fast.
Let set until fully cooled and then pop it out of the molds or cut into squares.