Grilled Tuna Sandwiches with Onions, Bell Peppers, and Chile-Cilantro Mayonnaise
The tangy citrus quality of the mayonnaise pairs well with the grilled tuna--a favorite of Marianne Legato. When the weather is nice, prepare this on the grill. Red bell peppers are a good source of antioxidant beta-carotene, and the amount of bell peppers in just one sandwich delivers almost a whole day's requirement for vitamin C.