Preheat the oven to 180°C (356°F).
White Sauce: In a pot, melt butter over medium heat. Add flour to form a roux. Gradually whisk in milk until smooth, then simmer until thickened. Incorporate cream, season to taste, and keep warm.
Filling: In a pan, sauté onion until fragrant. Add garlic, herbs, and seasoning, followed by pork mince. Cook until browned. Add mushrooms, Worcestershire sauce, tomato and onion relish, and jalapeño chutney. Season as needed.
Layering: In a baking dish, layer pork mixture, lasagna sheets, and white sauce, ending with a layer of white sauce. Top with mozzarella and cream cheese.
Bake for 35-40 minutes until golden. Serve garnished with fresh jalapeños and basil.