Add the onion cut in half and the olive oil and chop 10 sec at speed 4. Scrap the sides of the bowl and fry 4 min speed 1.5, 90 degrees.
Add the chicken livers, herbs, salt an pepper and the bourbon and cook at speed 1, 12 min, 90 degrees.
Puree at progressive speed 5 to 9 for 30 seconds.
Refrigerate 4 to 6 hours or overnight so the pâté firms up. The pâté will stay fresh up to 1 week.
Without Thermomix:
Fry the diced onion until soft, add the chicken livers, herbs, salt and pepper, and cook for about 10-15 min or until done (they can be a bit pink on the inside).
Puree in a food processor until smooth. Refrigerate 4 to 6 hours or overnight so the pâté firms up. The pâté will stay fresh up to 1 week.