Julienne the onion and garlic and sauté in a skillet without any oil or butter. The juices of the onion provide the perfect sauté base. While the onions sauté, dice the avocado and combine with spinach and tomatoes in a salad bowl.
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Sauté until tender and remove from heat. Combine with feta and let the heat from the onions melt the feta into oozy goodness! Serve the salad and top with the onion feta mix.