Chicken Caesar sandwich

for the Caesar dressing

• ½ cup Greek yoghurt
• 3 anchovy fillets finely chopped
• ½ garlic clove minced
• handful finely grated Parmesan cheese
• juice and zest of ½ lemon
• 1 teaspoon Worcestershire sauce 
• 1 tablespoon olive oil
• salt & pepper to taste

for the chicken

• 4 boneless skinless chicken breasts
• juice and zest of ½ lemon
• 3 tablespoons olive oil
• 1 teaspoon fresh thyme leaves
• 2 tablespoons chopped parsley
• Generous pinch of salt and pepper

for the sandwich

• bread of your choice
• cos lettuce leaves
• avocado sliced