I also like a cremed horseradish sauce/mayo on my brisket sammies. This also works very well.
Chipotle Mayo
2-3 CANNED CHIPOTLE CHILES IN ADOBO SAUCE (if small use 3)
1 TEASPONN ADOBO SAUCE
1-2 TEASPOONS WORCESTERSHIRE SAUCE
1 CUP MAYONNAISE
REMOVE SEEDS AND MINCE CHIPOTLE'S TO A PASTE. ADD ALL INGREDIENTS TOGETHER, STIR UNTIL COMBINED. REFIGERATE AT LEAST 4 HOURS. ENJOY