salade de cervelas a la olivier (that's me!)
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pp
200 a 260 g cervelas = 1 cervelas volaille (200g) ou boule de bale (260g)
75 g gruyere sale (c'est un max), plus si non sale'
1 medium red onion or 1 larger for 2 persons finely chopped 
1 gousse d'ail at least

2+ soup spoons olive oil
1+ soup spoon vinegar

1 soup spoon grain mustard (+/- flat)
1 turn salt and 5 to 6 turns of pepper black