Yes, it works. Do not use too much of it.

If you don't mind the pureé-like consistency, you can further speed-up the whole process in a pressure cooker (Instant Pot). Follow the steps 1-3 from this recipe: https://www.pressurecookrecipes.com/pressure-cooker-beef-cur...

--- 1) Prepare Pressure Cooker: Heat up your pressure cooker (Instant Pot: press Sauté button) over medium heat. Ensure your pot is as hot as it can be (Instant Pot: wait until indicator says HOT). 2) Pressure Cook Caramelized Onion Purée: Melt 3 tbsp (45g) unsalted butter in pressure cooker. Add in sliced onions, shallots, ⅓ tsp (1.3g) baking soda. Sauté until moisture starts to come out of the onions (~5 mins). Close lid and pressure cook at High Pressure for 20 minutes, then Quick Release. Open lid. 3) Reduce until Caramelized (takes roughly 16 – 17 mins): There will be lots of moisture from the onions. Reduce until most moisture has evaporated over medium high heat (Instant Pot: press cancel, Sauté button and Adjust once to Sauté More function). Stir constantly with a silicone spatula. Once most moisture has evaporated, adjust to medium heat (Instant Pot: press cancel and Sauté). Stir until onions are deep golden brown and all moisture has evaporated. Season with kosher salt & ground black pepper to taste. Remove caramelized onion purée and set aside.

thanks for the detail! I'll give it a shot. I do like my onions a bit firmer but sometimes an onion jam is a good thing

You need very little to make it work with onions.

I regularly use it in cooking, both for caramelizing onions and meat, can’t taste any weird flavours with it.

Pinch of baking soda thoroughly mixed with a teaspoon of sugar, then sprinkled over the chopped onions to make sure it gets evenly distributed.