Start by prepping all components before assembling the guacamole. Juice the limes into a small bowl, finely dice the red onion into 1/8-inch pieces, chop the cilantro, seed and mince the jalapeño, and halve the avocados lengthwise, removing the pits. Slice the black olives in half to create spider bodies, then cut a few additional slivers for legs. Slice the cucumber into thin rounds and have the blue corn chips nearby. This mise en place ensures everything is ready when you need it and prevents browning of the avocado.

Scoop the avocado flesh into a medium bowl and mash by hand to achieve a slightly chunky texture—I prefer leaving some texture rather than making it completely smooth, as it creates a more appealing bite. Add the lime juice and kosher salt immediately and stir gently to combine; the acid from the lime prevents the avocado from browning quickly. Fold in the diced red onion, cilantro, jalapeño, and ground cumin, stirring until everything is evenly distributed. Taste and adjust seasoning as needed.

Transfer the guacamole base from Step 2 into a serving bowl. Using a piping bag (or a small spoon if you don't have one), pipe the sour cream in four concentric circles across the top of the guacamole. Then, using a small knife or toothpick, draw straight lines from the center outward like spokes on a wheel to create the classic spider web effect. This creates a striking Halloween presentation while keeping the sour cream layers defined.

Place one halved black olive in the center of the spider web to serve as the spider's body. Arrange the slivered black olives around it as legs, positioning them radially outward for a creepy effect. Now add the "face" details: position cucumber slices as eyes (you can cut them slightly to resemble wide-open scared eyes), and use the black beans to create pupils within the cucumber slices and arrange a few more beans below as a mouth. Tuck blue corn chips around the edges of the bowl to create hair-like texture and position a few chips as a "nose" if desired. I like to create an asymmetrical, mischievous expression—it's more fun and looks more intentionally spooky.

Arrange the remaining tortilla chips around the guacamole bowl for dipping. The guacamole is best served immediately after assembly to maintain the visual impact of the spider web design and ensure the avocado stays fresh and bright green. Serve with additional tortilla chips and encourage guests to dig in!