Whole30 Shrimp and Cauliflower Grits

Name: Whole30 Shrimp and Cauliflower Grits
Ingredients: 1 large head cauliflower (about 2 pounds), trimmed and cut into small florets; 1 1/2 cups plain unsweetened almond milk, without carrageenan; 4 tablespoons extra-virgin olive oil; Kosher salt and freshly ground black pepper; 1/3 cup nutritional yeast, optional; 6 collard green leaves, stems removed, halved lengthwise, and thinly shredded crosswise (about 4 cups); 1 1/4 pounds peeled and deveined tail-on medium shrimp; 2 large cloves garlic, minced; Pinch of cayenne pepper, optional; 1/4 cup fresh flat-leaf parsley, roughly chopped; Juice of 1/2 lemon, plus lemon wedges, for serving