Tri Tip Sandwiches with Spicy Chipotle Mayonnaise

6 tablespoons mayonnaise
3 canned chipotle chiles, finely chopped
6 onion or French rolls
1 deli precooked tri tip, thinly sliced against the grain
3 very thin slices red onion, separated into rings
Combine mayonnaise and chiles in a small dish and mix well. Spread equal amounts on one half of each roll. Top with sliced beef and onions.
NOTE: For an even spicier taste, stir in a little of the sauce that is covering the chiles.
Serve with fresh fruit and tortilla chips.
Makes 6 servings.