ขนมถ้วยสีรุ้ง

ขนมถ้วยสีรุ้ง — Rainbow Khanom Thuai for Beginners

Introduction

ขนมถ้วยสีรุ้ง (rainbow khanom thuai) is a playful, colorful take on the classic Thai coconut cup dessert. These small steamed treats are soft, slightly chewy, and topped with creamy coconut — perfect for parties or a fun weekend project. This beginner-friendly recipe uses simple flours and natural colorings so home cooks can make beautiful layered cups with minimal fuss.

Ingredients

Yields: about 24 small silicone cups (adjust quantities for larger molds)

• 1 cup (140 g) rice flour
• 1/2 cup (70 g) tapioca starch (tapioca flour)
• 3/4 cup (150 g) granulated sugar (adjust to taste)
• 1/4 teaspoon salt
• 2 cups (480 ml) coconut milk (full-fat for best texture)
• 3/4 cup (180 ml) water
• Natural colorings (choose 4–6):
• Pandan juice or pandan paste (green)
• Butterfly pea flower tea (blue) — add a few drops of lemon for purple
• Beetroot juice (pink)
• Carrot or pumpkin juice (orange)
• Turmeric diluted with a little water (yellow)
• Cooking oil or neutral oil, for greasing molds
• Optional topping: 1/2 cup coconut cream mixed with a pinch of salt (to drizzle after steaming)

Instructions

1. Prepare the colorings: make small bowls of each natural color you plan to use. For butterfly pea, steep 1–2 teaspoons dried petals in 1/4 cup hot water, strain, and cool. For pandan, blend a few pandan leaves with 2–3 tablespoons water and strain to get green juice (or use paste). Adjust intensity — you need only a teaspoon or two per layer.
2. Mix dry ingredients: in a large bowl, whisk together rice flour, tapioca starch, sugar, and salt until evenly combined.
3. Add liquids: slowly whisk in the coconut milk and water until a smooth, lump-free batter forms. If you want an extra-smooth batter, strain through a fine sieve into a clean bowl.
4. Divide and color: divide the batter evenly into separate small bowls (one bowl per color). Stir a small amount of each natural coloring into each bowl until you reach the desired shade. Remember the color will darken slightly once steamed.
5. Prepare steamer and molds: bring water to a gentle boil in a steamer. Lightly oil silicone or porcelain khanom thuai molds to prevent sticking. Place molds on the steamer rack.
6. Steam the first layer: spoon about 1–2 teaspoons of the first (bottom) color into each mold so the layer is thin. Cover the steamer and steam for 2–3 minutes until the layer is just set (surface no longer jiggles). If using a very hot steamer, reduce time to avoid overcooking.
7. Add subsequent layers: when the first layer is set, gently spoon the next color on top (another 1–2 teaspoons). Steam again for 2–3 minutes. Repeat with remaining colors, building up thin layers. Work quickly but gently so the layers adhere to each other.
8. Final steam: after adding the last layer to all cups, steam the entire tray for an additional 5–7 minutes to ensure all layers are fully cooked and bonded. Cover the steamer with a clean towel under the lid to prevent water droplets from dripping onto the cups.
9. Optional coconut cream topping: if using, spoon a thin layer of salted coconut cream onto each cup and steam for 1 additional minute, or simply spoon the coconut cream on after cooling for a creamy finish.
10. Cool and unmold: remove the molds from the steamer and let them cool to room temperature. The cups will firm slightly as they cool. Gently loosen each piece with a small knife or pop out silicone molds. Serve at room temperature or chilled.

Cooking Tips

These practical tips will help you nail ขนมถ้วยสีรุ้ง on your first try:

• Thin layers set faster and make a prettier rainbow — aim for 1–2 teaspoons per layer depending on cup size.
• Use natural color concentrates sparingly. For vivid color with less liquid, use strong extracts like pandan paste or concentrated butterfly pea tea.
• Keep the steamer water at a gentle boil. A rolling boil can create uneven heat and cause bubbling or cracks in the layers.
• Cover the steamer lid with a clean kitchen towel to prevent condensation from dripping onto the cakes and blurring the layers.
• If you prefer a firmer texture, increase tapioca starch by 1–2 tablespoons; for softer texture, slightly increase coconut milk.
• Work quickly between layers so the bottom layer doesn’t cool too much — warm batter bonds layers better.
• Store finished ขนมถ้วยสีรุ้ง in an airtight container in the refrigerator for up to 3 days. Bring to room temperature before serving for best texture.

Nutritional Information

Approximate per small cup (one serving):

• Calories: ~80–110 kcal
• Fat: 4–7 g (mostly from coconut milk)
• Carbohydrates: 10–14 g (from rice flour, tapioca, and sugar)
• Protein: 0.5–1.5 g
• Notes: Nutrition will vary depending on coconut milk fat content, sugar amount, and final cup size. These values are rough estimates for one small khanom thuai.

Conclusion

ขนมถ้วยสีรุ้ง is a colorful, crowd-pleasing version of the beloved Thai khanom thuai that’s perfect for beginners. With simple ingredients, a bit of patience layer-by-layer, and natural colorings, you can create beautiful rainbow cups at home. Try different flavor combinations (pandan-bean, citrus, or lightly salted coconut cream on top) to make the recipe your own. Happy steaming — and enjoy your ขนมถ้วยสีรุ้ง!