Greek Spinach Salad is a refreshing dish for a hot summer day. Prepare the spinach ahead of time by washing and storing it in plastic bags. The cucumbers can be pre-marinated in the dressing, which gives them an additional zest. Feta cheese, an important ingredient in many Greek dishes, is added both to the greens and to the dressing. Pine nuts top the salad as a garnish. Serve with crusty French bread and chilled white wine.