In a small bowl, whisk together the vinegar, orange juice, shallot, salt and pepper. Drizzle in the olive oil, whisking constantly until emulsified.
In a dry, heavy skillet, toast the pepitas over medium heat for 3 to 5 minutes, or until slightly puffed and golden. Add the soy sauce and stir to mix, then immediately remove from the heat and turn the pepitas out onto a plate to cool.
Remove any tough stems from the arugula. Scoop out seeds from papaya, slice into eighths and pare off skin. Cut into julienne.
In a large serving bowl, combine the arugula, papaya, Cabrales, and pomegranate seeds. Drizzle on enough vinaigrette to coat and toss gently. Sprinkle on the toasted pepitas and serve immediately.
To remove pomegranate seeds: Cut out the blossom end, with some pith but without cutting into the seeds. Score the skin in quarters, then break the fruit apart gently, following the lines. Bend back the rind and pull out the seeds (if you do this under water, the pith and rind will float and the seeds will sink).
c.1997, M.S. Milliken & S. Feniger, all rights reserved