Preheat oven to 425 F.
On large baking sheet, place cauliflower in single layer. Add olive oil and salt; toss well to combine. Roast 30 minutes, tossing halfway through.
To make cabbage slaw: In medium mixing bowl, add cabbage, carrots, cilantro, lime juice, olive oil, maple syrup and salt. Toss to combine; set aside to soften.
To make peanut sauce: In blender, blend prunes, milk, peanut butter, soy sauce, lime juice, maple syrup, ginger, sriracha and water until smooth. Taste and add more water, if desired.
Warm tortillas, fill with roasted cauliflower and top with slaw, peanut sauce, green onions, prunes and peanuts. Serve with lime wedges.