Lekker is a slang term in South Africa originally meaning good food. The definition, however, has somewhat changed and now has many different meanings, such as having a nice time, or finding someone attractive.
A Potjie pot is a big part of South African cooking. It is a big clay pot (similar to a dutch oven) used by many to create stew-like dishes containing meats and vegetables called Potjiekos ("small pot food"). Every South African with a Potjie has their own special way of cooking their Potjiekos; there are even festivals to award the best!
Pap (or Mieliepap) is a kind of porridge commonly eaten in South Africa. It is made with what is known as mielie-meal, or ground maize (basically corn meal). It can be eaten for breakfast (typically with milk and sugar), or served with meat, curries, chilies, stews or other vegetables for a more savoury food. Pap is a staple food in most houses.
Mielie-meal or ground maize is a large staple food of South Africa. It is made by finely grinding up corn kernels, and is used in many recipes, such as pap, melktert, and polenta. Mielie-meal is quite simple to make, and is not too expensive either, so it is used very often in South African cuisine.
The grinding of corn to make mielie-meal is a very important food preparation technique in South Africa. The traditional way (displayed in the photo) would be to finely grind up corn by hand with two large stones. The alternate, and much more commonly used way is to use a corn mill, which grinds the corn for you!