Paseros in this context = trellises for the vines.

-Surrounded by vineyards, olives and cereals, the municipality of Almachar stretches its lands by the bowl of the river Almáchar, from the Almachar low ridge (334m) to the Vallejo peak (609m) to the south. Farmhouses stand out on hillsides where the grapes are laid out to dry on distinctive **raisin beds. **
http://www.absoluteaxarquia.com/areas/routeraisin.html




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Note added at 4 horas (2009-02-24 07:18:57 GMT)
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There are also some delicacies from Cómpeta, such as Pasas ( raisins) these are Cómpeta grapes dried on the **raisin beds***, miel (honey) locally produced by bees & Caña (honey) locally produced through sugar cane. All of these are available in the local shops and are good value www.andalucia.com/taste/home
http://www.google.co.uk/search?hl=en&q=raisin route areas sp...

apparently they need to be on a slope, and the grapes are laid on trays on these terraces to dry out...

A few G-hits, although not a lot for "drying terraces" as such. So maybe there's a proper, more technical term for this, but if not, then this is accepted and gives the idea

Raisin Production Manual - Google Books Result

by L. Peter Christensen, University of California ... - 2000 - Raisins - 295 pages
Trim the canes back to 12 to 18 inches (30 to 46 cm) from the ground to help reduce shading of the raisin drying terrace. Also, early harvest (by September ...
books.google.com/books?isbn=1879906449...

[PDF] Grape Notes

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Raisin vineyards are tilled deep in late summer to prepare the drying terrace, and this reduces the cover crop stand that establishes in the fall. Dried- ...
cetulare.ucdavis.edu/newsletterfiles/Grape_Notes8004.pdf - Similar pages

[PDF] RAISINS

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drying terrace. See related paragraph under Production section. Harvest. Harvest begins the third year and the fruit is picked for raisins. ...
coststudies.ucdavis.edu/files/grraistdsj06.pdf

The Future for California Raisins Is Drying On the Vine

Drying On the Vine. Most California raisins are produced from the. Thompson Seedless variety and by sun drying on paper trays placed on a terrace between ...
cetulare.ucdavis.edu/pubgrape/rg599.pdf - Similar pages
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The future of California raisins is drying on the vine

hand-harvested raisin grapes are dried on individual paper trays placed on a smooth terrace prepared between vine rows. When drying is complete, the ...
calag.ucop.edu/0502AMJ/pdfs/Raisins.pdf - Similar pages
by WL Peacock - Cited by 1 - Related articles - All 10 versions

[PDF] Project Title: Dry-On-Vine (DOV) Raisin Production Research

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raisin trays may be placed on a south-facing terrace, in the row middles, to dry. A North-South. (NS) row orientation might be preferable for DOV raisins if ...
www.calraisins.org/about/files/Evaluation_training_Systems....

I think "paseros" will be understood as it is described in the context

Drying the Grapes
Historically, the Malagenean owners of vineyards have separated part of their crops to make raisins. The grapes are laid on paseros (raisin dryers) next to the farm houses. Paseros built in the form of rectangular white sloping platforms can be seen throughout Axarquia.
http://www.absoluteaxarquia.com/food/wine.html

The variety of grape used is Moscatel:
This is home to the famous Moscatel wine grape, which you will also see drying on the hillsides to make raisins.
http://www.rusticblue.com/axarquia.htm