The first method (fast cooking method): Add 450 grams of grooved lasagna slowly and one by one to 4.5 liters of boiling water with a small amount of salt and oil and after 2-3 minutes, rinse with cold water. Or grease Pyrex with butter or olive oil and fill it layer by layer with lasagna and the desired sourdough and add white sauce and pizza cheese on the last layer. Second method (golden method): (without the need for cooking): First, dilute the prepared meat or vegetable sauce with hot water (half a glass). Grease the bottom of the fireproof dish or Pyrex with butter or olive oil and layer with grooved lasagna. Fill dry (without the need for baking) and dilute the desired yeast and add on the last layer of white sauce and pizza cheese. Place the dish containing the lasagna in the oven at 220 degrees for 25-30 minutes until it turns golden. Now the lasagna is ready to eat.