Variations; Butter, compound butters, flavored olive oils, bell peppers, roasted bell peppers, jalapeƱos, habanero, bacon, pancetta, prosciutto, chives, scallions, celery, carrots, ginger, honey, lime, crushed pepper flakes, coriander seed, fennel, basil, arugula, spinach, zucchini, yellow squash, eggplant, pesto, horseradish, potatoes, corn, white wine, tarragon, dill, asparagus, mint, broccoli, capers, paprika, green beans, sage, brown butter, cheddar, parmesean, romano, gruyere, lentils, tomatoes, white vinegar, champagne vinegar, avocado, peas, savory, white wine vinegar, yellow onion