Mahabharat S07 E07 Arjun learns about the plot

On receiving Shakuni's message, Purochan decides to set the palace on fire. Purochan also poisons the sweet dish. To test the sweet dish, Bheem takes it to the mouse. Arjun understands Duryodhan's plan when he discovers that the palace is built of lacquer. How will the Pandavas save themselves?