Add baby spinach and 1 cup water into a blender (I used my Vitamix). Turn on blender and gradually increase to the highest speed. Blend until the spinach is completely broken down. Transfer to a bowl.

Once you finish this step, jump to the noodle-making process to make the dough.

Bring a small pot of water to a boil. Blanch carrots until tender, 5 to 8 minutes. Drain and rinse with cold water to cool. When the carrots have cooled enough to handle, transfer them to the blender with 1 cup water. Turn on blender and gradually increase to the highest speed. Blend until it forms a smooth paste. Transfer to a bowl.

Once you finish this step, jump to the noodle-making process to make the dough.

Bring a small pot of water to a boil. Blanch beets until tender, about 5 minutes. Drain and rinse with cold water to cool. When the beets have cooled enough to handle, transfer them to the blender with 1 cup water. Turn on blender and gradually increase to the highest speed. Blend until it forms a smooth paste. Transfer to a bowl.

Once you finish this step, jump to the noodle-making process to make the dough.

Add red cabbage and 1 cup water into the blender. Turn on blender and gradually increase to the highest speed. Blend until the cabbage is completely broken down. Transfer to a bowl.

Add the flour and salt into a high-powered blender or food processor with 2/3 cup of dye liquid.

Pulse until it starts to form a dough ball and lift off the blades, about 30 seconds. Add more dye liquid if the dough does not come together, 1 tablespoon at a time. Add a little more flour if the dough looks too moist. Pulse for another 20 to 30 seconds. Dust a thin layer of flour onto your working surface. Transfer the dough onto it and knead for 2 to 3 minutes. Transfer the dough to a bowl and cover with plastic wrap. Let rest for 30 minutes.

Clean your blender (or food processor) before proceeding to the next color.

Once you've made all the doughs, start making the noodles. At this stage you can cover the doughs with plastic wrap and store them in the fridge for a day, or freeze them for a month. Thaw completely before making noodles.

Divide each dough into four even pieces, shaping the four pieces into dough balls. Work on one piece at a time, returning the remaining doughs to the bowl and covering them.

Heat chicken or vegetable broth in a pot until boiling. You should prepare 6 to 8 cups of broth for each color.

Bring a large pot of water to a boil over medium-high heat. Only cook the portion of noodles you're about to serve.

Add noodles, one color (or 3 to 4 servings) at a time, and immediately stir with chopsticks (or tongs) to separate the noodles. Boil until the noodles are cooked through, about 1 minute for thin noodles or up to 3 minutes for thicker noodles.

Use tongs to transfer the noodles to a strainer. Flush with tap water to cool. Drain and transfer to serving bowls.

Serve immediately.

Dust the bottom of an airtight container with flour. Generously sprinkle flour onto the noodles. Fold the noodles into the container and cover. Store in the freezer for up to 1 month.

To cook frozen noodles, cook them like you would cook fresh noodles, without thawing. You'll need more cooking time, about 4 to 6 minutes depending on the thickness of the noodles.