Slice the three ripe avocados in half, remove the pits, and scoop the flesh into a mixing bowl. Mash until desired texture is reached, about 2-3 minutes.

Squeeze the juice of one lime into the mashed avocados and mix well to ensure even distribution, about 1 minute.

Add the finely chopped red onion, diced tomatoes, minced jalapeño, and chopped cilantro. Gently fold to combine without over-mixing, about 2 minutes.

Sprinkle salt and pepper into the guacamole, adjusting to taste for a balanced flavor, about 1 minute.

Shape the guacamole onto a serving platter into a brain-like figure, taking 2-3 minutes.

Drizzle red food coloring over the guacamole to create 'veins', using just a few drops for the desired effect, about 1-2 minutes.

Chill the guacamole in the refrigerator for about 15 minutes if desired before serving with spooky-shaped tortilla chips.