Low Carb Tuna Casserole (With Cauliflower

Ingredients

• 2 tablespoons butter
• 1 tablespoon dijon mustard
• 1 teaspoon ground black pepper
• pinch cayenne
• 6 ounces brown rice pasta, cooked al dente
• 1 cup shredded sharp cheddar cheese, divided
• scallion, for garnish
• 1 teaspoon fine sea salt
• 2-4oz cans genova tuna, drained
• 3 tablespoon arrowroot
• 3 cloves garlic
• 1/2 cauliflower, about 1 lb., cut into florets
• 1/2 teaspoon paprika
• 2 celery stalks, diced
• 2-1/2 cups cashew milk
• 1 onion, diced
• 1/3 cup frozen green peas