Pretzel Bacon King: Allergens at a Glance
The honest verdict
Pretzel Bacon King · Burger King
The Pretzel Bacon King is a premium Burger King sandwich built on a salted pretzel bun with two flame-grilled beef patties, thick-cut smoked bacon, melted American cheese, and a smoky special sauce. The allergen profile is anchored by wheat from the pretzel bun, milk from the cheese and sauce, egg from the mayonnaise-based sauce, and soy from the bun and sauce ingredients. Sesame may appear in the bun via bakery processing or sesame oil. Peanut, tree nut, fish, and shellfish are not typical ingredients. This is a different allergen profile from the standard Whopper (which has a seeded bun and different sauce) and from the Bacon King (which uses a regular sesame seed bun). Always confirm with your specific Burger King location before ordering.
Allergen details change and vary by location. This is a general guide — always confirm with the restaurant before ordering. Not official or medical advice.
Key facts
The Pretzel Bacon King uses a salted pretzel bun distinct from Burger King's standard sesame seed bun, changing the sesame allergen profile.
The special sauce on the Pretzel Bacon King is mayonnaise-based, introducing egg as a confirmed allergen (unexpected for a burger).
Burger King flame-grills all patties on shared surfaces, creating cross-contact risk between beef, chicken, and veggie patties.
Every major allergen, one clear grid
Each of the nine major allergens marked for Pretzel Bacon King at Burger King — Contains, May contain (cross-contact or varies), or Free. Anything we couldn't confirm defaults to "may contain," because a shared kitchen can't be ruled out without the restaurant's official menu.
- MilkContains
American cheese and the smoky special sauce both contain milk/dairy. The cheese is a primary ingredient; the sauce may contain milk solids or cream.
- EggContains
The special sauce on the Pretzel Bacon King is mayonnaise-based, which contains egg. Egg is also a possible ingredient in the pretzel bun dough at some bakeries.
- Wheat / GlutenContains
The pretzel bun is wheat-based, made from enriched wheat flour. This is the defining carbohydrate source of the sandwich and cannot be removed without eliminating the bun entirely.
- SoyContains
Soy appears in multiple components: soybean oil in the sauce, soy lecithin in the cheese, and soy flour or oil in the pretzel bun. Soy is a pervasive ingredient in this sandwich.
- PeanutFree
Peanut is not an ingredient in the Pretzel Bacon King. No peanut oil or peanut-derived ingredients are used in the standard build.
- Tree NutFree
Tree nuts are not listed as ingredients in the pretzel bun, beef patties, bacon, cheese, or sauce.
- FishFree
Fish is not an ingredient in the Pretzel Bacon King. The special sauce does not contain anchovy or fish-based ingredients (unlike Worcestershire-based sauces at some chains).
- ShellfishFree
Shellfish is not an ingredient in any component of this sandwich.
- SesameMay contain
The pretzel bun may contain sesame oil or be processed in a bakery that handles sesame seeds. Unlike the standard Whopper bun which has visible sesame seeds, the pretzel bun's sesame status depends on the specific bakery supplier. Check with your local Burger King.
“May contain” means cross-contact is possible or the answer varies by location — not that the allergen is a listed ingredient. For a severe allergy, treat “may contain” the same as “contains” until the restaurant confirms otherwise.
Small changes that remove an allergen
Simple modifications that can take an allergen off your pretzel bacon king. Always name your allergy when you order and ask staff to confirm — a modification only helps if the kitchen prepares it separately.
Order without cheese
Order without the special sauce
Request a lettuce wrap or no bun
Order the standard Bacon King (regular sesame seed bun) instead
A modification lowers exposure but doesn't erase cross-contact from shared fryers, grills, or prep surfaces. For a severe allergy, confirm the prep with a manager before you eat.
Read this before you order
Cross-contact & severe allergies
A “free of” mark on the grid above means the allergen isn't an ingredient — it doesn't mean the item was made in an allergen-free kitchen. Two things matter most:
Shared fryers & equipment
Burger King flame-grills beef patties on shared surfaces. The same grill may cook chicken patties, veggie burgers, or other items. Bun toasting surfaces may contact other bread products. Cross-contact risk is moderate and standard for fast-food burger chains. If you have a severe wheat or milk allergy, confirm that separate preparation surfaces and utensils can be used.
If your allergy is severe
For anaphylactic allergy to wheat, milk, egg, or soy, the Pretzel Bacon King is not a safe choice without restaurant-level confirmation. The bun, cheese, and sauce are integral to the sandwich and cannot be fully removed without fundamentally changing the item. If you cannot verify preparation details, consider a plain beef patty with a lettuce wrap instead. Carry your epinephrine auto-injector.
This guidance is general and can't account for how any single location prepares your food. The restaurant's staff and official allergen menu are the final word — when in doubt, ask, or choose something else.
❓Frequently Asked Questions
Yes, the primary difference is the bun. The regular Bacon King uses a standard sesame seed bun (sesame is a known, visible allergen), while the Pretzel Bacon King uses a pretzel-style bun that may contain sesame oil or be processed in a sesame facility. The special sauce and cheese are the same between the two. If sesame is your concern, the regular Bacon King has visible seeds; the pretzel version has uncertain sesame status depending on the bakery supplier.
Yes, the pretzel bun is made from wheat flour and contains gluten. There is no gluten-free bun option at Burger King for this sandwich. A lettuce wrap or bunless order removes the wheat, but cross-contact from shared toasting surfaces is still possible. Burger King does not offer a certified gluten-free menu.
Removing the cheese removes a major milk source, but the special sauce also contains milk solids or cream in most formulations. For a dairy-free order, request no cheese and no special sauce. The beef patties and bacon are typically dairy-free by ingredient. Confirm with your location whether the sauce contains milk, as formulations vary by region.
The special sauce is a smoky mayonnaise-based sauce. It contains egg (from mayonnaise), milk (from cream or milk solids), and soy (from soybean oil and lecithin). It is not the same as the Whopper sauce. The sauce is a significant allergen source for egg, milk, and soy — removing it eliminates all three from the sandwich.
Yes, peanut is not an ingredient in any component of the Pretzel Bacon King. Burger King does not use peanut oil for frying. The risk of peanut cross-contact is very low for this sandwich. However, always confirm with the restaurant that no peanut-containing items are prepared on shared surfaces.
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Please verify before ordering
Allergen info changes and varies by location
Recipes, suppliers, and preparation methods change often and differ between locations, so the details here can go out of date or not match your specific Burger King restaurant. Always confirm directly with the restaurant and check its official allergen menu before ordering. This page is a general research summary — it is not official information from Burger King, and it is not medical advice. If you have a food allergy, decisions about what is safe to eat should be made with the restaurant and, where relevant, your healthcare provider.