(about 4 1/2 lb), trimmed to about 7 inches, split ... and
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leeks (about 4 1/2 lb), trimmed to about 7 inches, split lengthwise to within 1 1/2 inches of the root end, the roots trimmed but the root ends left intact, the tough outer leaves discarded, and the leeks washed well, vegetable oil for grilling, dijon-style mustard, white-wine vinegar, extra-virgin olive oil, minced assorted fresh herbs , such as chives, parsley, mint, basil, and tarragon, diced red bell pepper, kalamata or other brine-cured black olives, pitted and diced fine.