Crawfish Gravy

Ingredients

• 1 pound thick-sliced smoked bacon, cut into 1/2' pieces
• 6 tablespoons all-purpose flour
• 1/2 cup each finely chopped onion, green bell pepper, and celery
• 1/4 cup seeded, finely chopped jalapeños
• 3 tablespoons finely chopped garlic
• 2 teaspoons cajun spice mix
• 3 cups low-salt chicken broth of shrimp stock
• 1 pound peeled crawfish tails or coarsely chopped peeled shrimp
• kosher salt, freshly ground pepper
• cayenne pepper (optional)
• 1/2 cup chopped scallions