Make the pickled red onions by whisking together all the ingredients (but the onions). Add the onions, fill with additional water if needed to submerge. Cover and sit for at least 1 hour.
Make the creamy onion dressing: Process all of the ingredients in a food processor until smooth. Store the dressing in the refrigerator.
If making the jack-o-lantern, cut off the top. Cut out a large block of the fruit by using a paring knife and then a large spoon. From the block of fruit, slice out the sections to use in the salad and store in the refrigerator until ready to assemble the salad. Use the spoon to scrape the sides clean. Use your knife to cut out shapes.
Lightly toast your almonds in a skillet over medium heat. Stir frequently to make sure they don’t burn. Remove from heat once golden and fragrant.
Assemble your salad. Serve and enjoy!