Preheat your grill to high heat.
Meanwhile, rub the ears of corn with the olive oil, then rub with ground cumin and a pinch of salt and pepper.
Grill the corn, turning every 6 to 9 minutes, until nice and charred. This takes about 15 to 20 minutes. Set aside until cool enough to handle.
While the corn cools off, add all the beans into a large mixing bowl. Use a paper towel to gently press them to remove any excess liquid.
Add in the green onions and stir to combine.
Use a very sharp knife to cut off the cooked corn kernels. Add into the bowl with the beans, and stir to combine.
Add all the dressing ingredients to a small food processor and process until smooth and creamy, stopping to scrape down the sides frequently.
Pour the dressing over the corn and bean salad, and stir until well-coated. Season to taste with salt and then squeeze over the juice of ½ to 1 lime, according to your preference. Garnish with jalapeño slices.
Cover and refrigerate for at least 2 hours.
Enjoy!