Mash 1/2 avocado on one slice of bread. Season with salt.
Layer with the onion, jalapeno, tomato, cilantro, and lettuce.
Top with the second slice of toast. Cut in half. Serve immediately.
Nutritional values are approximate and are based on 1/4 of the recipe. Refrigerate leftovers promptly and use within 1 day.Variations: feel free to mix and match the vegetables, based on what you have. Other additions can include: hummus, shredded carrot, roasted red pepper, sliced black olives, and sliced or shredded zucchini.