Offering of alms to monks and nuns is likely different in Buddhist minority countries, compared to Buddhist majority countries.
Please see this page by the Buddhist Society of Western Australia (BSWA), for a guide on offering food to the Sangha of BSWA.
Please see this page by the Amaravati Buddhist Monastery in Hertfordshire, England, for a similar guide.
Please see this page by the Sirimangalo International Monastery and Meditation Centre in Ontario, Canada, for a similar guide.
The three monasteries mentioned above are based on the Thai Theravada tradition.