Banh Mi (Vietnamese-Style Sandwich)

Ingredients

• 1 tsp. canola oil
• 1 tbsp. finely chopped yellow onion
• 12 oz. ground pork
• 2 tbsp. hoisin sauce
• 2 tbsp. soy sauce
• 1 tsp. toasted sesame oil
• 1⁄2 tsp. Asian-style hot sauce
• 1⁄2 tsp. Chinese five-spice powder
• 1⁄2 tsp. red food coloring
• 1⁄4 tsp. onion powder
• 1⁄4 tsp. garlic powder
• 1⁄4 tsp. freshly ground black pepper, plus more to taste
• 1⁄4 cup distilled white vinegar
• 1⁄4 cup sugar
• 1⁄2 cup julienned carrots
• 1⁄2 cup daikon radish
• Kosher salt, to taste
• 4 10" Vietnamese baguettes or Portuguese rolls, split
• 1⁄2 cup mayonnaise
• 8 1/8"-thick slices Vietnamese-style pork roll (cha lua) or bologna
• 8 1/8"-thick slices Vietanmese-style salami or ham
• 1⁄2 cup cilantro sprigs
• 1⁄2 medium English cucumber, cut lengthwise into 4 thick slices
• Asian-style chile oil, to taste