To avoid the basil becoming too warm and getting bitter while mixing, you can put the basil leaves in the fridge for a while and put some ice cubes onto them. You can also put the bottom part of the mixer / food processor in the fridge as well.
40 grams fresh basil
roast the pine nuts at medium-low heat in a frying pan until they become slightly brown. Be sure to toss them from time to time and not to burn them.
30 grams pine nuts
Grate the Parmigiano Reggiano so it will be easier to stuff it into the food processor later. Otherwise you can also just cut smaller cubes.
100 grams parmesan cheese (Parmigiano Reggiano)
Add the cold fresh basil, parmesan cheese, garlic, roasted pine nuts as well as most of the olive oil into the food processor or pestle and mortar. Mix or grind until you get a homogeneous and creamy texture.
1-2 dl olive oil extra vergine, 1 clove garlic
Taste the Pesto and add a pinch of salt & pepper according to your taste. Also add more olive oil if the pesto is still a bit too thick. Mix again and put the pesto aside for later.
1 pinch pepper, 1 pinch salt