At the risk of sounding like a midnight infomercial, here is the best spanakopita, or Greek spinach pie, you’ll ever eat. It’s oniony-sweet, cheesy, and the herbs melt into the spinach to deepen the flavor. I have yet to find a restaurant version that can beat this. We usually see spanakopita as either an appetizer or a main dish. But with today’s “mezze mania,” you can bake up a batch, freeze it, then reheat a few triangles to go along with hummus, a few diamonds of kibbee, or whatnot to turn a meal into a party. I like to bake from scratch, but draw the line at filo. Other than my friend Wendy, who…