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Lightly toast the pine nuts by placing them in a frying pan for about 2 minutes, just until a gentle aroma begins to rise from the pan.
Place the basil, garlic, and nuts into a food processor and blend into a paste. Alternatively use a mortar and pestle to blend the mixture.
Turn the paste out into a bowel and add half the grated parmesan (this should be finely grated). Mix well.
Add enough olive oil to make the mixture wet, season to taste with salt and black pepper.
Add the rest of the cheese and continue to add oil, maintaining a fairly wet mixture.
Continually taste and alter the seasoning as desired. When happy add the lemon juice and mix.
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