Pastrami Matzo Kugel

Name: Pastrami Matzo Kugel
Ingredients: 2 c. low-sodium chicken stock; 4 large eggs, beaten to blend; 2 tbsp. spicy deli mustard; 2 tbsp. whole-grain mustard; 1.5 tsp. kosher salt, plus more; 0.5 tsp. freshly ground black pepper, plus more; 1 (11-oz.) package matzo; 3 tbsp. extra-virgin olive oil, divided; 0.75 lb. thick-cut pastrami, chopped into 1/2 cubes; 1 medium yellow onion, thinly sliced; 4 cloves garlic, finely chopped; 2 tsp. caraway seeds; 1 c. Tuscan kale, center ribs and stems removed, sliced into ribbons; 1 c. sauerkraut