Cold Udon with Grapefruit Ponzu
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 28 Jan 2026
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This vibrant cold udon with grapefruit ponzu is a refreshing and sophisticated dish that balances zesty citrus with the savoury depth of soy and ginger. By using fresh grapefruit and lemon as the base for a homemade dressing, you create a complex flavour profile that perfectly complements the chewy texture of the udon noodles. The addition of lightly charred cherry tomatoes adds a subtle sweetness and smoky note, making this a truly standout meal for warm afternoons.
As a high-protein vegetarian option, this noodle bowl is ideal for a nutritious lunch or a light dinner that doesn't skimp on satisfaction. The combination of chilled noodles and crisp cucumber provides a cooling effect, while the toasted sesame seeds and nori add a professional finishing touch. It is a quick and versatile recipe that brings the bright, clean flavours of Japanese-inspired fusion cooking into your home kitchen.
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Ingredients for Cold Udon with Grapefruit Ponzu
1 grapefruit, halved
1 lemon, halved
1 red chilli (such as Fresno), seeds removed, finely chopped
1 (2") piece ginger, peeled, finely grated
80ml unseasoned rice vinegar
3 tablespoons soy sauce
1 teaspoon sugar
1125ml cherry tomatoes
1 garlic clove, finely grated
1 tablespoon extra-virgin olive oil
A pinch of kosher salt
500g frozen udon noodles
2 medium Persian cucumbers, peeled, very thinly sliced on a diagonal
Coriander sprigs, crumbled nori, and toasted sesame seeds (for serving)
How to make Cold Udon with Grapefruit Ponzu
Back to contentsHeat grill. Squeeze grapefruit and lemon halves into a fine-mesh sieve set over a large bowl; discard pulp (you should have a little more than 120ml juice). Mix in chilli, ginger, vinegar, soy sauce, and sugar. Cover ponzu and chill.
Toss tomatoes, garlic, oil, and salt on a rimmed baking sheet. Grill until tomatoes are soft and lightly charred, 10–12 minutes. Let cool.
Cook noodles according to package directions; drain and rinse under cold water to stop the cooking. Transfer noodles to bowl with ponzu and toss to coat. Divide noodles and ponzu among bowls and top with charred tomatoes, cucumbers, coriander, nori, and sesame seeds.
Disclaimer
While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.
Article history
The information on this page is peer reviewed by qualified clinicians.
28 Jan 2026 | Originally published
Authored by:
UK recipe editors
Peer reviewed by
UK recipe editors

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