A quick to pull-together grown-up Pesto Grilled Cheese Sandwich when nothing else will do. This tasty sammie features sourdough bread, a 5-minute garlicky sage pesto, and melty Gruyere cheese that's grilled to perfection in a skillet. It's ready for sharing in about 25 minutes, and a perfect vehicle for dipping into creamy soup. *see blog post for cheese options.
Preheat oven to 350F (180C). Toast the almonds for 7-8 minutes or until toasty and fragrant. Set aside to cool.
In a food processor, add the almonds, sage, garlic, lemon juice, zest and sea salt. Process until small bits form. With the processor running, pour in the olive oil in a steady stream. Process for another 30 seconds or until a chunky paste forms.
Set aside until ready to use. Or, for longer storage, store in a lidded container for up to 4 days in the refrigerator or freeze for up to 3 months.
For the Sandwich:
Preheat a 10" Cast Iron Skillet on medium low while spreading a thin layer of mayonnaise (or butter) on one side each of two slices of bread. In the skillet, place the mayonnaise (butter) sides down into the pan and spread about 1 1/2 tablespoons of pesto on each side. Divide about 1/3 cup (33 grams) of cheese total, between both slices of bread. With Mayo: Grill both slices of bread, cheese side up, on medium with lid on for 6-7 minutes (set a timer). The bread will just start to become golden. Remove from heat and let sit, lid on, for an additional 4-5 minutes (again, set a timer) or until the bread is golden and toasty. With Butter: Grill both slices of bread, cheese side up, on medium-low with lid on for four minutes (set a timer). Remove from heat and let sit, lid on, for an additional three minutes (again, set a timer) - but check after two minutes just to make sure the bread isn't getting too dark.
Using a spatula, remove each side carefully from the pan and put the sandwich together. Cut and serve right away.
If serving a few at the same time, place in a warmed 200F (93C) oven while grilling the other sandwiches.