What concepts are described in the following sentence?

"The bacon sandwich is a variation of a BLT, which contains tomato. The BLT is a variant on the club sandwich. Bacon sandwiches are popular in the UK, were Elizabeth II is the head of state."

Return the answer as pairs of triples.
Bacon sandwich DISH_VARIATION BLT
BLT DISH_VARIATION Club sandwich
BLT INGREDIENT Tomato
Bacon sandwich COUNTRY United Kingdom
United Kingdom LEADER_NAME Elizabeth II