Line a 10 x 15 inch cookie sheet with parchment paper.
In a medium saucepan combine the margarine, sugar, water and salt.
Over medium heat, stir the mixture constantly until it reaches 300°F. Use a candy thermometer for this.
Once the temperature reaches 300°F, add the vanilla extract and pour onto prepared cookie sheet.
Spread the mixture evenly until the desired thickness has been achieved and let it cool.
Mix the chocolate chips and shortening in a microwave safe bowl and heat until smooth. About 30 seconds.
Pour over the toffee and spread evenly.
Optional Candied Hemp Heart Topping:
In a small saucepan, mix the sugar and water over medium heat until it is a nice golden brown – about 5 minutes.
Add the hemp hearts and stir for another 2-4 minutes.
Pour onto a parchment lined cookie sheet or plate and sprinkle with salt.
Let cool about 10 minutes and then pour over the chocolate covered toffee as it starts to cool.
When everything is cooled, break into pieces to serve.