Glazed Korean Rice Cake Skewers with Spam

Name: Glazed Korean Rice Cake Skewers with Spam
Ingredients: 1/2 teaspoon instant dashi (see Note); 1/4 cup gochujang (see Note); 2 tablespoons honey; 2 tablespoons rice vinegar; 2 teaspoons soy sauce; 1 teaspoon toasted sesame oil; 1 pound 3-inch-long Korean rice cakes (see Note); 8 ounces Spam, cut into 1-inch cubes; 2 shallots, quartered through the root end; 1 zucchini, cut into 1-inch pieces; 1 red bell pepper, cut into 1-inch pieces; 3 tablespoons canola oil; Kosher salt; Black sesame seeds, chopped cilantro and crushed peanuts, for serving