First prepare the aioli. I always use an electric whisk but you could also use a stick blender or even whisk it by hand. You also get better results if you let the egg yolk come up to room temperature.
In a bowl whisk up the egg yolk and add a little bit of olive oil. Just add it while you whisk and make sure to add just little drops in the beginning. Keep going until the mixture starts to thicken a bit.
Once it gets to that stage, you can add more olive oil in a thin stream while whisking.
When the mayonnaise has the desired consistency, add the garlic, lemon juices and season with salt.
For the meatballs first soak the stale bread role in water.
In a big bowl add all the ingredients for the meatballs. Drain the bread roll and press all the water out of it. Add to the meat mixture.
Mix everything well. You can do it by hand or you can use a hand mixer. It might look odd to mix some meat with it, but then the mixture comes together really well.
In a large pan heat a a couple of teaspoons of oil. Form the meatballs with your hands or using two spoons and fry them until they are cooked through and browned on both sides.