Spinach Pesto Grilled Cheese

Ingredients for Spinach Pesto:

• 1 cup baby spinach leaves
• 1 TBS olive oil
• 2 TBS walnuts pine nuts, almonds would also work
• 2 TBS freshly grated Parmesan cheese
• Pinch of salt and pepper

Ingredients for sandwiches:

• 4 pieces of crusty bread I like sourdough
• butter
• 6 slices smoked gouda could do a mix of gouda and mozzarella too
• ½ cup baby spinach
• prepared spinach pesto