Is the hamburger tomato real? It is a real experimental project, not a tomato you can buy. Gabriella Rothberg, a 17-year-old student in the Miami area, is working with University of Miami PhD candidate Maddison Marshall on genetically engineering tomato plants to produce heme, an iron-containing molecule associated with meat flavor. The project, called Impossible Vines, has not yet shown in a taste test that its tomatoes taste like hamburgers.
What Gabriella Rothberg’s hamburger-tomato project is
Rothberg is a senior at Ransom Everglades and is reported as a co-inventor on the project’s patent. Marshall, a University of Miami doctoral researcher, worked with her on the biology. Rothberg’s father, biotechnology entrepreneur Jonathan Rothberg, is also listed as a co-inventor, while Impossible Vines Inc. is identified as the patent assignee.
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The goal is not to add tomato flavoring after harvest. Instead, the team is trying to change what the living plant makes so that a tomato contains heme-related flavor chemistry associated with meat. Rothberg described the intended result to Miami New Times this way: “So you’ll bite into a tomato, and it’ll taste like a hamburger.”
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How the proposed flavor engineering works
Using Agrobacterium to deliver genetic material
The reported method uses Agrobacterium, a bacterium commonly used in plant biotechnology to transfer genetic material into plant cells. The researchers are attempting to introduce genetic instructions that would enable tomato plants to produce heme.
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Why heme matters to meat flavor
Heme is an iron-containing molecule found in biological systems and associated with the flavor characteristics of meat. In this concept, the plant would produce the target molecule internally, rather than having a manufacturer mix flavor compounds into a processed meat substitute. Producing heme in a tomato, however, does not by itself establish that the fruit will reproduce the aroma, taste, texture or cooking behavior of a hamburger.
What the 2026 patent does—and does not—prove
U.S. Patent No. 12,668,806 was reported as issued in June 2026; the Biscayne Bay Beacon gives June 30, 2026 as the issue date. The patent lists Gabriella Rothberg and Jonathan Rothberg as inventors and Impossible Vines Inc. as assignee.
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A patent records intellectual-property rights over a claimed invention. It is not a sensory study, food-safety clearance or commercial launch announcement. The patent does not prove that the tomatoes taste like hamburgers, contain a particular amount of heme, deliver a nutritional benefit or are ready for people to eat.
Has anyone tasted the tomatoes?
Not according to the reporting available in October 2026. Coverage says the tomatoes have not undergone taste testing, have not entered commercial production and have not been shown to deliver the intended flavor or nutritional benefits. That means the central claim remains a design objective, not a demonstrated result.
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There is also no reported consumer product, seed packet or growing kit for sale. Generic tomato seeds would not be the engineered project and should not be presented as a way to grow it.
Why the team says the idea could matter
Rothberg has described a broader ambition: making nutrients such as absorbable iron more accessible in places where meat is expensive or difficult to obtain. That is a stated long-term goal, not evidence that the project has improved iron status or health outcomes.
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- No human nutrition study has been reported.
- No published nutrient analysis establishing an iron advantage has been reported.
- No clinical outcome or dietary recommendation follows from the project’s current status.
How this differs from processed plant-based meat
| Question | Hamburger-tomato concept | Processed plant-based meat |
|---|---|---|
| Where flavor compounds are produced | Inside a genetically engineered whole plant, if the approach works | Added or developed during food processing and formulation |
| Evidence available | No reported taste test or demonstrated nutritional outcome | Products can be evaluated through ordinary product testing, although results vary by product |
| Regulatory and development stage | Experimental project with a reported 2026 U.S. patent | Established commercial category subject to applicable food rules |
| Can consumers buy it? | No reported commercial tomato, seeds or kit | Availability depends on the specific product and market |
The comparison is therefore about development stage as much as flavor: the tomato concept is still waiting for basic sensory and nutritional validation.
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- Confirm plant performance: show that the introduced genetic material is stable and that plants reliably produce the intended molecule.
- Measure the fruit: quantify heme and other relevant compounds, and check whether levels are consistent across plants and harvests.
- Run sensory testing: use properly designed tasting studies to determine whether people detect a hamburger-like flavor and whether they consider it acceptable.
- Evaluate safety and nutrition: assess allergens, unintended metabolites, exposure levels and any claimed nutritional effect.
- Complete regulatory review and production work: establish how the crop would be grown, labeled and distributed in the jurisdictions where it is sold.
The bottom line for readers
Gabriella Rothberg’s project is a genuine attempt to engineer a tomato plant to make heme, backed by a reported U.S. patent. But as of October 2026, it remains an untested concept: no reported taste trial has shown a hamburger flavor, no commercial launch has occurred and no seeds are available to consumers. The potential iron-access goal is likewise aspirational until laboratory, human-nutrition and real-world food testing provide evidence.
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