Steam 1lb of baby spinach until wilted, approximately 5 minutes. Drain and squeeze out excess water. Transfer to a food processor and add 2 cloves chopped garlic, 1/4tsp red pepper flakes, 1/3 cup toasted pine nuts or walnuts, 1/3 cup grated parmesan cheese. Pulse until finely ground. While machine is running add 1/4 cup extra virgin olive oil and the zest of 1 lemon.