- acid – vinegar and lemon juice
- anchovies
- dairy – butter, cream, strong hard cheeses, and blue cheese
- herbs – parsley, chives and tarragon
- garlic
- nuts – hazelnuts, chestnuts and almonds
- mustard
- onion (especially roasted)
- pork – bacon, sausage meat and chorizo
- spices – black pepper, caraway, chilli, nutmeg and mustard seeds
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