Oyster sauce salt, should be added to the sauce, since the oysters should provide all the savoury flavour. However, this method is prohibitively expensive. Many modern oyster sauces are thickened with cornstarch, flavoured with oyster essence or extract and darkened with caramel. Vegetarian oyster sauce prepared from mushrooms, often oyster mushrooms or shiitake mushrooms, is also popular and generally lower in price. It may contain more taste enhancers if less mushroom extract is used to reduce costs. Most of the oyster sauces available on the market contain added monosodium glutamate (MSG). In recent years MSG-free varieties can also be found. The taste
Portobello Institute Portobello Institute Portobello Institute is a private post leaving certificate college specialising in healthcare, beauty therapy, Montessori, travel, business, and creative studies. The institute is a registered HETAC and FETAC provider. It has a variety of programmes validated by a number of bodies including HETAC, ACCA (Certified Accounting Technician), BIFM, City & Guilds, FETAC, ICM, IFMA, ILM, ISSA, ITEC, and Virgin Airways. Many of its courses are aimed at specific jobs in industry, as well as professional training courses, many of its courses would be FETAC level, the Montessori Training Course would be a HETAC Level 6 Higher Certificate course.