To make the balsamic figs, cut off the end stem from each fig then cut into quarters top to bottom.
Mix the orange juice, sugar and vinegar in a small pan and add the figs. Stir so that the sugar dissolves, bring to a boil and simmer for around 15 minutes so that the liquid becomes sticky.
Transfer to a container and set aside to cool. These can be made ahead and stored in the fridge for a few days.
To make sandwich
When ready to make sandwich, cut open the croissant through the middle and lightly toast it.
Put a handful of arugula on one side, topped with slices of prosciutto and pieces of fig. On the other side, carefully spread some goats cheese (it may be hard as it's crumbly, but do as best you can). You can gently toast the cheese side under the broiler/grill so that it softens.
Put the two pieces together and enjoy.
Video
Notes
If fresh figs are not available, you could substitute fig preserves/jam.