Make the basil pesto, mozzarella cheese and sourdough sandwich bread or purchase store-bought alternatives.
Preheat your cast iron skillet over low to medium heat.
Spread butter on one slice of bread and place it in the skillet.
Cover the slice of bread with fresh basil pesto.
Add some slices of fresh mozzarella and fresh tomatoes to the bread in the skillet.
To another slice of bread spread pesto on one side and butter on the other side. Add this slice of bread, butter side out to your sandwich.
Repeat for as many sandwiches as you need to make for your family for a meal.
When the bottom side of your sandwich is toasted and golden brown, flip it over using the spatula. Cook it on the other side until it is also toasted and golden brown. Sometimes I also put a lid on the skillet for just a few minutes to help melt the cheese.
These steps are all shown in our tomato pesto grilled cheese sandwich video shown above. The video is on our YouTube channel as well.
And that's it - simple as that and so delicious!! Serve alongside a garden fresh salad and you have the perfect summer meal.
Store any leftovers (although I bet you won't have any) in an airtight container in the refrigerator for up to a week.
These grilled cheese sandwiches are also perfect for a summer BBQ and are easy to make over the campfire or on your Blackstone grill.