Following is my tasting note for the wine in question. I suspect that your "peppery" and my "spicy" are synonymous in this case.
Herzog, Zinfandel, Special Reserrve, Lodi, 2005: Deep royal purple in color, medium- to full-bodied, with soft tannins integrated nicely and showing appealing spicy plum and berry fruits. Long and generous. Drink now-2009. Score 88. (Tasted 12 Mar 2007)