Measure out the fruit juice of your choice into a smaller saucepan and add the agar powder. If using sugar add it now.
Place the saucepan on very low heat and let the agar dissolve slowly. If using granulated sugar, make sure that's dissolved too before the next stage.
Taste the fruit juice mixture and add any extra ingredients - such as lemon juice, any spices, salt etc.
Bring the saucepan to a boil and carry on boiling for 5 minutes, whilst stirring slowly but constantly.
Take the saucepan from the hob and pour into your moulds (or use a small pipet to fill the gummy bears). Make sure that you have your gummy bears (or any silicone moulds) on a firm tray first, so that you can move them without bending afterwards.
Place the vegan gummy bears moulds into the fridge for a minimum of 15 minutes or until the gummy bears are set.
Take from the moulds and keep in an airtight container for 1-4 weeks.