Cook the white rice according to package directions and allow it to cool slightly before assembling the bowls.
Prepare the vibrant lime dressing by combining the canola oil, lime juice, lime zest, minced garlic, Dijon mustard, chili powder, sea salt, and freshly ground black pepper in a mason jar. Secure the lid tightly and shake vigorously until the mixture emulsifies into a smooth, tangy dressing. Store in the refrigerator until ready to use.
To assemble the bowls, divide the shredded lettuce evenly among six serving bowls. Layer the cooled rice, black beans, corn, halved cherry tomatoes, and avocado slices on top of the lettuce, arranging each ingredient in its own section for a vibrant, eye-catching presentation. Add a generous portion of slow-cooked pulled pork if desired.
Right before serving, shake the dressing once more and drizzle it over each bowl. Garnish with fresh lime wedges for a bright, citrusy finish.