Prepare a 16 cm frame by lining the bottom with cling film. You can also use small silicone molds.
Mix the pectin with the 100 g of sugar (3.5 oz).
Put the fruit purée and glucose in a saucepan.
Place the saucepan over medium heat.
When the mixture is warm (around 40°C / 104°F if you have a thermometer), gradually add the pectin-sugar mixture while whisking.
Bring to a boil (when the mixture starts bubbling), then gradually add the 500 g of sugar (17.6 oz) to maintain the boil. Add the sugar in 3 or 4 additions while stirring.
Once all the sugar is incorporated, use a thermometer to monitor the temperature. The mixture should reach 105–106°C (221–223°F).
Remove the saucepan from the heat at 105°C (221°F), add the tablespoon of lemon juice (4 g / 2 tsp / 0.14 oz), and mix well. From this point, you must act very quickly, as gelling begins. If you use a frame, no problem. For individual molds, you need to fill each cavity quite quickly.
Pour the mixture into the prepared frame on a Silpat mat or into silicone molds.
Let set until the next day, preferably, but after 2 hours, the raspberry fruit jellies are already quite firm.
The next day, unmold the frame and cut the raspberry fruit jellies into small cubes. Roll them in granulated sugar, then place them on a serving dish or store in a container, separating each layer with parchment paper.