Fresh garlic can be roasted, fried or added to sauces and even eaten raw, so your replacement will need to be suitable for the cooking method. Choose from garlic paste, powder, flakes, oils and more or go allium free with cumin, asofoetida or ginger.
Eggs work well with soft leaf herbs like basil, sage, tarragon, chervil, dill, chives, parsley and coriander with the last three examples being a fantastic garnish. Dried herbs that work well with eggs include rosemary, thyme, oregano, marjoram and fennel and coriander seed.
Good alternatives for peri peri include jalapenos, habanero and cayenne peppers. Or you could try ready made mixes of chili powder and paprika. You want to recreate the heat of piri piri without becoming overpowering and a mix of alternative peppers can be the right idea.
Certain essential oils like peppermint, cloves and anise will harm your dogs nasal passages as well as being potentially toxic. Other essential oils like tea tree or ylang ylang could produce other effects of poisoning. It is important to keep your dogs away from these oils, even in small amounts.
An oil diffuser is designed to get the best out of your essential oils in terms of health benefits as well as aroma. Certain rooms have different requirements and I know that I need a more intense scent in the kitchen then overnight in my bedroom. So we use different diffusers in different ways.
Really there is variation between essential oils vs fragrance oils which may not actually make that much difference on a day to day level. But for those who want more than just a nice smell it is important to know the differences.