THE THREE DIAMOND DOOR
211 KNICKERBOCKER AVENUE, Brooklyn, NY 11237 · Restaurant (American)
Inspection summary
THE THREE DIAMOND DOOR has been inspected 3 times by NYC Department of Health and Mental Hygiene (DOHMH) since June 16, 2023. The most recent inspection, on March 28, 2026, recorded 3 infractions.
None of the 3 inspections on record were free of infractions. In the past 12 months there was 1 inspection with 3 infractions recorded. The higher-risk findings here relate to: Pests, Protecting food from contamination and Cleaning and sanitizing.
What these findings mean
Health authorities word their violations differently, so we group them by what they mean for food safety. Higher-risk findings are the ones inspectors treat as critical, because they can directly make someone sick.
PestsHigher risk
Signs of mice, rats, cockroaches or flies, or gaps and clutter that let them get in or hide. Pests carry bacteria and can contaminate food and surfaces, so evidence of activity is treated seriously and usually triggers a follow-up visit.
Recorded 5 times across 2 separate inspections, most recently on September 21, 2024. For example:
Filth flies or food/refuse/sewage associated with (FRSA) flies or other nuisance pests in establishment’s food and/or non-food areas. FRSA flies include house flies, blow flies, bottle flies, flesh flies, drain flies, Phorid flies and fruit flies.
Protecting food from contaminationHigher risk
This covers how food is stored, prepared and displayed: raw meat kept away from ready-to-eat food, food covered and stored off the floor, and nothing dripping or splashing into it. Cross-contamination from raw to cooked food is a direct route for salmonella and E. coli.
Recorded 2 times across 2 separate inspections, most recently on March 28, 2026. For example:
Raw, cooked or prepared food is adulterated, contaminated, cross-contaminated, or not discarded in accordance with HACCP plan.
Cleaning and sanitizingHigher risk
Anything that touches food, such as cutting boards, dishes and utensils, must be washed, rinsed and sanitized. Inspectors check dishwasher temperatures, sanitizer strength and how wiping cloths are stored. Poor sanitizing lets bacteria survive from one use to the next.
Recorded once on March 28, 2026. For example:
Food contact surface not properly washed, rinsed and sanitized after each use and following any activity when contamination may have occurred.
Food safety training and certificationLower risk
Most jurisdictions require a certified food handler or manager on site, and some require allergen or food-worker training. These findings mean the paperwork or the trained person was missing at the time. They do not by themselves mean food was handled unsafely.
Recorded once on March 28, 2026. For example:
Food Protection Certificate (FPC) not held by manager or supervisor of food operations.
Equipment and utensilsLower risk
Equipment has to be built from cleanable materials, kept in good repair and stored properly. These findings are mostly about upkeep, like a cracked shelf, a worn gasket or utensils stored the wrong way. They are generally lower risk but show how well the kitchen is maintained.
Recorded once on September 21, 2024. For example:
Non-food contact surface or equipment made of unacceptable material, not kept clean, or not properly sealed, raised, spaced or movable to allow accessibility for cleaning on all sides, above and underneath the unit.
About this data
These results come from NYC Department of Health and Mental Hygiene (DOHMH), which inspects food premises and other public facilities in this area. We republish the authority's public disclosure data and refresh it regularly; the official record is the final word.
3 inspections
- Cycle Inspection / Initial Inspection
3 infractions
- 06D: Food contact surface not properly washed, rinsed and sanitized after each use and following any activity when contamination may have occurred.
- Critical
- 04A: Food Protection Certificate (FPC) not held by manager or supervisor of food operations.
- Critical
- 04H: Raw, cooked or prepared food is adulterated, contaminated, cross-contaminated, or not discarded in accordance with HACCP plan.
- Critical
- 06D: Food contact surface not properly washed, rinsed and sanitized after each use and following any activity when contamination may have occurred.
- Cycle Inspection / Re-inspection
3 infractions
- 04N: Filth flies or food/refuse/sewage associated with (FRSA) flies or other nuisance pests in establishment’s food and/or non-food areas. FRSA flies include house flies, blow flies, bottle flies, flesh flies, drain flies, Phorid flies and fruit flies.
- Critical
- 10F: Non-food contact surface or equipment made of unacceptable material, not kept clean, or not properly sealed, raised, spaced or movable to allow accessibility for cleaning on all sides, above and underneath the unit.
- Not Critical
- 08A: Establishment is not free of harborage or conditions conducive to rodents, insects or other pests.
- Not Critical
- 04N: Filth flies or food/refuse/sewage associated with (FRSA) flies or other nuisance pests in establishment’s food and/or non-food areas. FRSA flies include house flies, blow flies, bottle flies, flesh flies, drain flies, Phorid flies and fruit flies.
- Cycle Inspection / Initial Inspection
4 infractions
- 04K: Evidence of rats or live rats in establishment's food or non-food areas.
- Critical
- 08A: Establishment is not free of harborage or conditions conducive to rodents, insects or other pests.
- Not Critical
- 04N: Filth flies or food/refuse/sewage associated with (FRSA) flies or other nuisance pests in establishment’s food and/or non-food areas. FRSA flies include house flies, blow flies, bottle flies, flesh flies, drain flies, Phorid flies and fruit flies.
- Critical
- 04H: Raw, cooked or prepared food is adulterated, contaminated, cross-contaminated, or not discarded in accordance with HACCP plan.
- Critical
- 04K: Evidence of rats or live rats in establishment's food or non-food areas.
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