Peel and dice potatoes
Put it in a microwaveable bowl, pour in half a bowl of water, cover with plastic wrap, poke holes with a toothpick, cook on high heat for 5 minutes, then turn to medium-high heat for another 4 minutes
Take it out, let it cool for 2-3 minutes, then add the yellow mustard
After the potatoes are softened, add salt, sugar, and milk and continue to mash
Finally, stir with a spoon until it forms a dough
Use a tool to grind a little lemon zest into the mashed potatoes, put it into a piping bag with a flower nozzle, and squeeze out the flower shapes in order in a paper cup