Tiger Prawn Extraction & Umami Synergy: Elevating Flavor Through Science

In the world of culinary technique, few methods offer as much control over flavor and aroma as the extraction method. In Part Three of my extraction video series, I demonstrate how to apply this method to prawns—preserving delicate volatile compounds while unlocking powerful umami synergy. The resulting prawn bisque, combined with tomato-saffron broth and finished with a makrut lime herb oil, is a dish rooted in both science and finesse.

Understanding the Science: Why The Extraction Method?

Shrimp and prawns are rich in volatile aroma compounds like pyrazines, thiazoles, and thiazolines that give them their signature sweet, oceanic scent. However, these compounds degrade quickly under high heat. Conventional stovetop simmering at or above 90°C for more than 20 minutes can strip shrimp of this defining character, replacing it with bitter or muddy notes.

Instead, steeping prawn shells at 85°C for one hour preserves these aromas, yielding a rich oceanic extraction that becomes the foundation of the final sauce. This method, inspired by Yannick Alléno’s patented concentration techniques, prevents thermal degradation and maintains integrity of both flavor and aroma.

You can find Yannick Allen’s extraction method patents here.

What Is Umami, Really?

Umami is often referred to as the “fifth taste,” alongside sweet, sour, salty, and bitter. Scientifically, umami is the taste of savory depth—roundness, meatiness, and mouth-coating richness. What makes umami especially powerful is that it doesn’t come from just one compound but from the synergistic interaction of three molecular components:

Glutamate – an amino acid found in abundance in tomatoes, kombu, and fermented products. This is the base umami compound.
Inosinate – a nucleotide commonly found in meat and seafood, especially in prawn shells, bonito flakes, and tuna.
Guanylate – a nucleotide most abundant in fungi like dried shiitake mushrooms and morels.

On their own, each of these contributes some umami. But when glutamate is combined with either inosinate or guanylate, a dramatic synergy occurs. These compounds bind simultaneously to umami receptors on the tongue, amplifying perceived umami flavor by up to ten times compared to glutamate alone.

The Power of Umami Synergy

This dish is a practical showcase of that synergy. The prawn shells provide inosinate, while the tomato broth supplies the glutamate. For final plating I serve it with maitake mushroom which contain low-moderate guanylate levels.

Key Note

Do not sous vide whole prawn or shrimp. Cooking crustaceans sous vide leads to a mushy texture. Instead, finish them traditionally: pan-seared in foamy butter.

Tiger Prawn Extraction & Tomato Broth Sauce

Waymond D. Wesley II

Vacuum-extracted prawn broth with tomato umami, showcasing the science of flavor through umami synergy

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Ingredients

Tiger Prawn Extraction:

5 g garlic
50 g onion
339 g tiger prawn heads and shells
300 g water
10 g kombu
10 g salt
34 g pre-hy clarified xanthan gum water (5% of total extraction weight; pre-hy is 2% xanthan gum to water)

Tomato Broth:

650 g Roma tomatoes
114 g shio koji (6.5% salt)
9 g fresh lemon zest
12 g preserved lemon skin
1 long pepper (sub. 1 tsp whole black peppercorn)
1 g saffron
33 g pre-hy clarified xanthan gum water (optional)

Instructions

Tiger Prawn Extraction:

Combine garlic, onion, tiger prawn heads and shells, and water in a blender. Blend until a smooth pulp forms.
Transfer the pulp into a filter bag. Place the kombu inside the same filter bag.
Seal the filter bag under vacuum and cook sous vide at 186°F (85.5°C) for 1 hour.
After cooking, Cool the extracted liquid immediately in an ice bath.
Once cooled remove the filter bag and strain thoroughly, pressing and compressing the bag to extract as much liquid as possible.
Once cooled, add the salt and 34 g of pre-hy clarified xanthan gum water. Blend again until fully emulsified and incorporated.

Tomato Broth:

Combine Roma tomatoes, shio koji, fresh lemon zest, preserved lemon skin, long pepper, and saffron in a high-speed blender. Blend on medium-high until smooth.
Transfer the mixture to a Thermomix or a similar temperature-controlled mixer and cook at 85°C (185°F) for 20 minutes.
Strain the cooked mixture through a filter bag and a fine sieve. Compress and squeeze the filter bag to extract all broth.

Final Sauce:

Combine equal parts of the tiger prawn extraction and the tomato broth to form the finished sauce.