In your blender or food processor, pulse together the mango, lime juice, 1/2 of the jalapeño (if using), and a large handful of cilantro with the large stems removed until well well combined. There should still be a little texture to it.
Cut avocados in half, remove the pit, and scoop out the insides with a large spoon into a bowl. Dice the tomato and red onion and add to avocado mixture. Add salt and pepper and stir.
Pour the mango mixture over the avocado mixture. Season to taste, and garnish with cilantro and extra lime, and serve with tortilla or plantain chips and veggies.
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Notes
Season to taste: If you like things a little extra spicy, add some more jalapeño. You may like more lime or salt, so taste and make any adjustments you'd like! To store leftovers: Transfer the leftover guacamole to an airtight container, cover tightly, and store it in the refrigerator for up to 2 days.