Queso Blanco (White Cheese Dip)

Bahan-bahan (6 porsi)

• 1 tablespoon butter or olive oil
• 1 small white onion, peeled and diced
• 1 large jalapeño pepper, cored and diced
• 2 cloves garlic, minced
• 1 (15 ounce) can diced tomatoes and chiles, drained
• 1 cup (8 ounces) evaporated milk
• 1 pound (16 ounces) white American cheese, diced into small cubes
• 8 ounces Monterey Jack cheese, diced into small cubes
• 2 cups (loosely-packed) chopped fresh baby spinach
• 1/4 cup chopped fresh cilantro
• fine sea salt and freshly-ground black pepper