This will amount to four five-strand peacock's eyes. For my part, I prefer to start a piece that is to be triangular or trapezoidal at the widest end and do a series of decreases to develop the shape. I find it easier to keep track of decreases. Naturally, this is done at the single crochet step. Knitters do this on most pullover sweaters.
Loops require tacking down or edging in.
Broomstick lace is no exception. Make three single crochets in the corner. Single crochet in the end of the single crochet row and continue as above. Pay careful attention to tension. When you get to the starting chain, do a three single crochet turn and single crochet across.