Plant-based burgers are built from four main categories of ingredients: a protein base (usually pea or soy protein), fats like coconut oil or cocoa butter, binding agents that hold the patty together, and flavoring compounds that mimic the taste and appearance of beef. The specific combination varies by brand, but the engineering goal is always the same: recreate the texture, juiciness, and browning of a ground beef patty using only plant-derived materials.
The Protein Base
Most commercial plant-based burgers rely on protein isolates or concentrates extracted from legumes. The Beyond Burger uses pea protein combined with mung bean protein, while the Impossible Burger is built on soy protein concentrate. These aren’t whole beans or peas you’d recognize from a grocery aisle. The proteins have been extracted, concentrated, and processed into a form that can be shaped and cooked like ground meat.
Other brands use different protein sources entirely. Some incorporate wheat gluten (also called seitan), mycoprotein (derived from fungi), or combinations of chickpea and lentil flour. A few use less common bases like jackfruit or mushrooms, though these tend to deliver less protein per serving. Gram for gram, the major brands have engineered their protein content to match a standard beef patty, typically landing around 19 to 20 grams per serving.
Research comparing plant-based and beef burgers found that differences in protein quality depend more on the raw materials used than on whether the protein comes from plants or animals. In other words, a well-formulated pea protein burger can hold its own nutritionally against beef, at least on the protein front.
Fats That Create the Sizzle
A plain plant protein patty would be dry and crumbly. Fats are what give plant-based burgers their juiciness, mouthfeel, and the sizzle you hear on a grill. Coconut oil is the most common fat source because its saturated fat content gives it a solid texture at room temperature, similar to the marbling in beef. When heated, it melts and releases moisture in a way that mimics animal fat.
Beyond Burger uses both coconut oil and cocoa butter in its formulation. The cocoa butter adds a second fat with a slightly different melting point, which helps the patty render more gradually during cooking rather than releasing all its moisture at once. Impossible Burger pairs coconut oil with sunflower oil, which contributes unsaturated fats and helps with cooking performance. This reliance on coconut oil is also why plant-based burgers carry a saturated fat content comparable to 80/20 ground beef, something that surprises many people who assume “plant-based” automatically means lower in saturated fat.
Binders That Hold It Together
Without the natural connective tissue found in animal muscle, plant-based patties need help staying in one piece. The most widely used binding agent is methylcellulose, a modified form of plant fiber. It has an unusual property: unlike most food ingredients that soften when heated, methylcellulose firms up. It forms a gel when it hits the heat of a pan or grill, which is what keeps a plant-based burger from falling apart during cooking. Once it cools, the gel relaxes, so the texture doesn’t feel rubbery when you eat it.
Potato starch and tapioca starch serve a supporting role, absorbing moisture and adding cohesion to the raw patty. Some brands also use sodium alginate, a seaweed-derived thickener, or bamboo fiber. Research on burger formulations has found that a methylcellulose solution of about 3% by weight can work as the sole binding agent in a soy-based burger, producing good texture without needing additional starches or thickeners.
What Makes It Look and Taste Like Beef
The most distinctive ingredient in the plant-based burger category is soy leghemoglobin, the signature component of the Impossible Burger. Leghemoglobin is a protein found naturally in the root nodules of soybean plants, and it contains heme, the same iron-carrying molecule that gives red meat its color and drives much of its flavor chemistry during cooking. Impossible Foods doesn’t harvest it from soybean roots, though. They inserted the gene for leghemoglobin into a yeast called Pichia pastoris, which produces the protein through fermentation at industrial scale.
When heme hits a hot surface, it catalyzes chemical reactions that transform simple nutrients into hundreds of volatile compounds. These are the molecules responsible for the smell and taste people associate with cooking meat. The FDA reviewed soy leghemoglobin and approved it as a color additive for use in ground beef analogue products in 2019, concluding there was reasonable certainty it is not harmful under its intended conditions of use.
Beyond Burger takes a different approach to color. Instead of heme, it uses beet juice extract to create a reddish, raw-meat appearance in the uncooked patty. For savory depth, many plant-based burgers include yeast extract, which is rich in glutamate, the amino acid responsible for umami flavor. Some formulations add smoked yeast, miso, or mushroom-derived ingredients to layer in additional savoriness.
How the Texture Gets Made
The ingredient list only tells part of the story. The manufacturing process is what transforms a slurry of plant proteins and fats into something with a fibrous, meaty chew. Most major brands use a technique called high-moisture extrusion. Plant proteins are mixed with water and pushed through a machine that applies intense heat and pressure. This forces the proteins to unfold and realign into long, parallel fibers, similar to the grain structure of muscle tissue. The process changes the physical properties of the protein so fundamentally that the final product tears and chews more like ground beef than like the pea or soy flour it started as.
Added Vitamins and Minerals
Because plant-based burgers are positioned as direct replacements for beef, many brands fortify their products with nutrients that red meat naturally provides. Iron is the most common addition, since plant-derived iron is absorbed less efficiently by the body than the heme iron found in meat. Vitamin B12, which doesn’t occur naturally in plant foods, shows up in some formulations. Certain brands also add calcium, niacin, thiamin, and zinc.
The extent of fortification varies widely. Some products, particularly those marketed in the UK, benefit from mandatory flour fortification laws that add iron and other nutrients through their wheat-based ingredients. Others rely on the naturally occurring minerals in their plant components, which can vary depending on where and how the crops were grown. Checking the nutrition label is the only reliable way to know what a specific product delivers, since two pea protein burgers from different brands can have very different micronutrient profiles.
The Full Ingredient Picture
A typical plant-based burger patty contains somewhere between 15 and 25 ingredients. Here’s what those generally break down into:
- Protein source: pea protein, soy protein concentrate, wheat gluten, mung bean protein, or mycoprotein
- Fats: coconut oil, sunflower oil, cocoa butter, or rapeseed oil
- Binders: methylcellulose, potato starch, tapioca starch, or sodium alginate
- Color: soy leghemoglobin (heme) or beet juice extract
- Flavor: yeast extract, natural flavors, salt, onion powder, garlic powder
- Fortification: iron, vitamin B12, calcium, B vitamins
Compare that to a basic beef patty, which is typically just ground beef (95%) with salt, pepper, and sometimes onion. The trade-off with plant-based burgers is clear: replicating something as biologically complex as meat from scratch requires a longer ingredient list and more processing. Whether that trade-off is worth it depends on your priorities, whether that’s environmental impact, avoiding animal products, or simply preferring the taste.