Why this formula works
Cook onions, oil, butter and salt covered for 10 minutes, then uncovered over medium-low heat for 40–45 minutes, deglazing browned fond with teaspoons of water before finishing with balsamic. The measured formula is designed around the final use, while the sensory checkpoint—Finished onions are reduced by about two thirds, deep chestnut but not black, and hold together in a glossy jammy tangle.—is more reliable than the clock alone.
Honest timing
| Active preparation | 15 min |
| Hydration / proof / preheat | 5 min |
| Cooking / baking | 55 min |
| Elapsed total | 1 h 15 min |
Ingredients
- yellow onions, sliced 3 mm with the grain700 g (24.7 oz)
- olive oil20 g (0.71 oz)
- unsalted butter20 g (0.71 oz)
- fine salt3 g (0.11 oz)
- brown sugar, optional only for pale onions5 g (0.18 oz)
- balsamic vinegar15 g (0.53 oz)
Equipment
- wide heavy skillet
- lid
- wooden spatula
- digital scale
Exact method
- 1. Weigh every ingredient before starting and complete all chopping, grating or temperature preparation; this recipe moves too quickly for measuring midway.
- 2. Set up the base exactly as follows: Cook onions, oil, butter and salt covered for 10 minutes, then uncovered over medium-low heat for 40–45 minutes, deglazing browned fond with teaspoons of water before finishing with balsamic.
- 3. Add the seasonings in the stated quantities and scrape the bowl or pan thoroughly, so no concentrated pockets remain.
- 4. Control the process by temperature and texture: Finished onions are reduced by about two thirds, deep chestnut but not black, and hold together in a glossy jammy tangle.
- 5. Taste a small cooled sample. Judge salt, acid, sweetness and heat in that order; warmth can hide both salt and chili.
- 6. Scrape into a clean container and complete the stated resting or cooling time. Stir once more before judging final consistency.
- 7. Use it deliberately: spread 50–80 g over a 30 cm pizza; pair with goat cheese, mushrooms, bacon or pear.
How to know it is ready
- Finished onions are reduced by about two thirds, deep chestnut but not black, and hold together in a glossy jammy tangle.
- A cooled spoonful is homogeneous, without watery seepage or a greasy ring.
- The primary ingredient remains recognizable after seasoning.
- The stated pizza dose gives flavor without making the base soggy.
Troubleshooting
- Too thin: first complete the rest; then correct in small measured additions rather than guessing.
- Too thick: loosen with the recipe's liquid 5 g at a time.
- Unbalanced: cool a sample before adding more salt, acid, sugar or chili.
- Separated: stop heating, transfer to a cool bowl and re-emulsify gradually.
How to adapt the base recipe
- spread 50–80 g over a 30 cm pizza; pair with goat cheese, mushrooms, bacon or pear.
- Scale by weight, not by spoons; keep every ingredient in the same ratio.
- Change only one of heat, acid or sweetness at a time and record the adjustment.
Storage and food safety
Cool and refrigerate up to 5 days, or freeze flat in 60 g portions for 3 months.
Allergens
Milk Depending on the selected product, may also contain: Sulphites.
Always verify every label and cross-contact risk; brand formulations can change.