Lasagna With White Sauce

• 1 1/2 italian seasoning
• 1 onion (chopped)
• 1 beef bouillon cube
• 1 te salt
• 475 ml milk
• 450 gr beef (ground)
• 270 gr tomatoes (diced)
• 230 gr pkg mini lasagna noodles (cooked)
• 220 gr mozzarella cheese divided (shredded)
• 34 gr tomato paste