The following is a recipe for chicken teriyaki from Just Hungry. You can adapt this method to other meats, and fish such as salmon, cod, sea bream, swordfish, etc
4 small or 2 large chicken thighs, boned
4 Tbs. soy sauce
1 tsp. grated fresh ginger
1 Tbs. mirin
1 Tbs. sugar
Cut the chicken into about 2" / 5cm pieces if necessary. (you can leave small thighs whole.) You can leave on the skin or take it off.
Heat up a frying pan with oil. Salt the chicken pieces very lightly and sear them on both sides in the oil.
As soon as the surface is golden brown, add the soy sauce and ginger, mirin and sugar. Lower the heat to medium-low, and cook the chicken, turning several times, until the sauce is reduced and syrupy.