This document summarizes a study on modifying a residential solar cooker by adding vacuum tubes filled with phase change materials (PCM) to enable nighttime cooking. The system uses a parabolic collector to concentrate sunlight into vacuum tubes containing PCM and copper coils. Heat is transferred to a cooker jacket through insulated pipes. A pump circulates water to cook food at temperatures up to 150°C. PCM stores excess heat for nighttime cooking. Calculations determine the required PCM mass is 57kg, which can be filled in two 124mm diameter vacuum tubes holding 40kg total, with the remaining 17kg stored in an insulated box. This modified solar cooker aims to reduce reliance on fuels like LPG for cooking.