Remove seeds and pulp from the pumpkin, then dice into 2cm cubes. Dice the sweet potato into 2cm cubes and soak in water for 5 minutes. Thinly slice the onion, soak in water, lightly massage, and squeeze out excess water after 5 minutes.

Place the pumpkin, sweet potato, and 1 tbsp of water in a microwave-safe container. Cover loosely with plastic wrap and microwave at 600W for about 5 minutes until soft. Drain the water and return to the container. While still warm, add consomme and salt, then mash roughly and let cool.