Wagyu Sweet Italian Sausage and Pepper Grinder

Name: Wagyu Sweet Italian Sausage and Pepper Grinder
Ingredients: PACKAGE Double 8 Cattle Company Fullblood Wagyu Sweet Italian Sausage (4 links); 3 tablespoons Grapeseed Oil; 2 tablespoons Butter; 2 teaspoons Kosher Salt; 1 Large Sweet Onion (julienned); 1 Red Bell Pepper (seeded, julienned); 1 Yellow Bell Pepper (seeded, julienned); 1 Orange Bell Pepper (seeded, julienned); 1 Green Bell Pepper or Poblano Pepper (seeded, julienned); 3 Garlic Cloves (minced); 2 teaspoons Oregano; 1/2 cup Mayonnaise; 1 teaspoon Dijon Mustard; 2 tablespoons Sun-Dried Tomato (minced); 4 Hoagie-Style Sandwich Rolls (sliced 3/4 of the way through so they can hold the sausage); 6 SLICE Fresh Mozzarella (thin slices); 1/4 cup Basil Leaves (chiffonade)