Fullblood Wagyu Kielbasa and Lentil Soup

Name: Fullblood Wagyu Kielbasa and Lentil Soup
Ingredients: 1 PACKAGE Double 8 Cattle Company Fullblood Wagyu Smoked Kielbasa (cut in half lengthwise and 1/4-inch-thick half moons); 1 Large Sweet Onion (diced); 1 Large Leek (cut in half lengthwise and diced); 5 Garlic Cloves (minced); 1 Large Red Bell Pepper (diced); 3 quarts Beef Stock; 2 cups Green Lentils; 1/4 cup Olive Oil; Kosher Salt (to taste); 2 tablespoons Red Wine Vinegar or Hot Sauce; 1 teaspoon Thyme; 4 ounces Greek Yogurt; 3 Large Carrots (diced to 1/2 inch pieces); 3 Stalks Celery (diced to 1/2 inch pieces); 1 cup Basil Leaves (plus additional for garnish); 12 ounces Tomato Paste; Freshly Ground Black Pepper (to taste)