Barbecue Chicken Sandwich - Chicken Farmers

Ingredients

• 4 boneless, skinless chicken breast(s)
• 1 tsp (5 mL) oregano, dried
• 2 tbsp (30 mL) oil
• 2 tbsp (30 mL) red wine vinegar
• 1 clove garlic, minced
• 1/2 tsp (2.5 mL) sugar
• 1/2 tsp (2.5 mL) Dijon mustard, coarse grain
• pepper, dash, freshly ground
• 1/2 tsp (2.5 mL) soy sauce
• 1 tbsp (15 mL) pesto
• 3 tbsp (45 mL) light mayonnaise
• 3 cups (750 mL) mushrooms, sliced, sautéed
• 1/2 cup (125 mL) roasted red pepper(s), thinly sliced
• 4 sun-dried tomatoes, thinly sliced
• 1 cup (250 mL) Havarti cheese, grated
• 4 Kaiser roll(s)