The Crunchy Beetroot, Kidney Bean & Tempeh Burger Patty

By Sonakshi  ·  @sonakshiwellness  ·  Plant-based  ·  High protein  ·  GF

Prep: 20 minutes  ·  Cook: 18 minutes air fryer  ·  Makes: 4 patties  ·  Difficulty: easy  ·  Vegan  ·  GF

 The story behind this one

I ate a beetroot burger at Mildreds in London and I have not stopped thinking about it since. There was this moment when you bit through the crust — genuinely crunchy, audibly crunchy — and hit the inside, which was soft and earthy and tasted unmistakably of beetroot. It was one of those food moments where you stop talking mid-conversation because something just landed perfectly.

I knew I wanted to recreate that at home. Not a faithful copy — my version is built from what I had, what makes sense for an Indian kitchen, and what actually holds together without a list of processed ingredients holding it hostage.

Three things in this patty: boiled beetroot for colour, sweetness, and that earthy depth. Kidney beans for body, protein, and binding. Tempeh for texture, nuttiness, and a fermented funk that makes the whole thing taste complex without trying. Flax gel holds it all together. No flour. No breadcrumbs inside. Clean.

"The crust is the moment. Everything else is the setup."

The coating is two steps — a layer of flax gel brushed on the outside, then pressed into breadcrumbs. Into the air fryer at 200 degrees and within eighteen minutes you have that crunch. Not approximated crunch. Actually crunchy. The kind where you hear it.

I serve these on my khapli atta burger buns — the recipe is on this site — but they work on any bun, in a wrap, or just on a plate with a salad and a dipping sauce.

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Ingredients

The flax binder

•       20g whole golden flaxseeds — grind fresh

•       60ml cold water

The patty

•       200g cooked kidney beans — drained, rinsed, and thoroughly dried

•       150g tempeh — roughly crumbled into small uneven pieces

•       150g boiled beetroot — patted very dry, roughly chopped

•       20ml tamari or soy sauce

•       8g smoked paprika

•       5g garlic powder

•       4g onion powder

•       3g ground cumin

•       2g black pepper

•       6g fine sea salt

•       10ml olive oil

The crust coating

•       Flax gel — same as the binder above, brushed on the outside

•       80 to 100g breadcrumbs — regular panko or GF certified breadcrumbs

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Method

Make the flax gel first. Grind the flaxseeds in a small blender for twenty seconds until completely fine. Whisk into the cold water immediately, stir well, cover, and rest for twelve minutes until thick and gel-like. This is your binder — it goes inside the patty and also gets brushed on the outside before the breadcrumb coat.

Drain, rinse, and dry the kidney beans aggressively — spread on a clean kitchen towel and press firmly. Any surface moisture weakens the patty and makes it fall apart during coating and cooking. They must be completely dry.

Place the kidney beans in a large bowl and mash with a fork until roughly seventy percent smooth and thirty percent chunky. You want some texture — a completely smooth paste produces a dense uniform patty with no bite to it. Add the crumbled tempeh and chopped boiled beetroot. Mix through.

Add tamari, smoked paprika, garlic powder, onion powder, cumin, black pepper, salt, and olive oil. Mix firmly until everything is combined. Add the flax gel and mix for one full minute — the mixture should come together into a cohesive, slightly tacky mass that holds its shape when you squeeze a handful. If it feels too wet add a tablespoon of breadcrumbs. If too dry add a splash of water.

Divide into four equal portions of approximately 130 grams each. Shape each into a round patty about ten centimetres diameter and two centimetres thick — slightly wider than your bun since it will shrink a little during cooking. Press the edges firmly. Place on a parchment-lined tray, cover, and refrigerate for thirty minutes minimum. This chilling firms the patty enough to survive the coating process without crumbling.

Set up two shallow bowls — flax gel in one, breadcrumbs in the other. Working with one chilled patty at a time: brush a generous layer of flax gel over both sides and all edges using a pastry brush or your fingers. Press firmly into the breadcrumbs on both sides and all edges — press hard so the crumbs embed into the surface rather than sitting loosely on top.

Preheat the air fryer to 200 degrees C for five minutes. Lightly brush or spray a little oil over both sides of each coated patty — this is what turns the crumbs golden and crunchy rather than dry and powdery. Place in the air fryer basket in a single layer. Cook for ten minutes, flip carefully, and cook for a further seven to eight minutes until both sides are deep golden and the crust sounds hollow when you tap it lightly.

Rest on a wire rack for three minutes before serving — not on a plate, which traps steam and softens the base. Serve immediately. The crust holds for about fifteen minutes before softening.

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Tips and swaps

•       Dry the beetroot well. Boiled beetroot holds a lot of surface water that will make the patty wet and soft. After boiling, chop and leave on a kitchen towel for ten minutes, pressing occasionally.

•       The thirty-minute fridge rest before coating is not optional. Cold patties coat cleanly. Room-temperature patties crumble.

•       These freeze brilliantly before coating — make a batch of twenty, freeze between parchment sheets, coat and air fry directly from frozen adding four minutes to the cook time.

•       For a GF version use certified GF breadcrumbs or fine polenta. Fine polenta gives an extraordinary crunch — arguably crunchier than panko.

•       The smoked paprika is doing most of the flavour work here. Do not reduce it.

•       These also work in an oven at 200 degrees C on a wire rack over a baking tray — twenty-five to thirty minutes, flipping halfway.

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Why this is good for your gut and your body

Kidney beans are one of the most nutrient-dense legumes available — high in plant protein, high in resistant starch which feeds beneficial gut bacteria, and rich in iron, folate, and B vitamins. For women with PCOS, consistent legume intake supports blood sugar regulation and reduces androgen-driven cravings by keeping insulin stable throughout the day.

Tempeh is fermented — which means the proteins and starches in the soy have already been partially broken down by beneficial bacteria. This makes it significantly easier to digest than tofu or unfermented soy, and it arrives with a probiotic benefit that supports gut microbiome diversity. Fermented foods are one of the most underused tools in plant-based eating for hormonal health.

Beetroot contains betaine and nitrates which support liver detoxification — the liver is responsible for clearing excess oestrogen from the body, a process that is frequently sluggish in women with PCOS. Beetroot pigments are also potent anti-inflammatories. The deep red colour is not just beautiful — it is the food doing its job.

Flax gel contributes lignans — plant compounds that modulate oestrogen activity — and soluble fibre that slows carbohydrate absorption and supports gut lining integrity.

"A burger that supports your hormones, feeds your gut bacteria, and also tastes extraordinary. This is what I mean when I say healthy food is not a compromise."

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One last thing

Make the full batch. They disappear.

The first one is always the tester — you learn the coating thickness, the oil spray, how your specific air fryer runs. By the second and third you have it dialled in and the crust is exactly what you want it to be.

Serve on the khapli bun with smoked paprika vegan mayo, shredded red cabbage, pickled onion, and sliced avocado. Or eat it straight off the wire rack the moment it comes out of the air fryer, which is what I always end up doing first.

Healthy food is not your problem. Boring food is.

— Sona

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About Sonakshi

Sonakshi is a certified holistic nutritionist, registered yoga teacher, and women's health coach based in Faridabad, India. She creates plant-based recipes designed to support gut health, hormonal balance, and a genuinely good relationship with food — through her content series Sona Eats, her coaching programme Heal Her, and JUNO, her line of gut-friendly clean treats. Find her at @sonakshiwellness on Instagram.