Place your raspberries into a bowl or a jar and mash with a fork to a pulp then stir in the sugar and chia seeds. You can add more sugar if you want your jam to be a little sweeter, it all depends on the fruit you're using - my raspberries were incredibly sweets so I only ended up using one spoon of sugar.
Place in the fridge for at least 30 mins - the chia seeds will absorb the moisture and turn the mixture into a delicious spreadable, spoonable jam which can be enjoyed on toast, scones or stirred into porridge. Enjoy!